How to for loop file and print new line with awk for two columns

This is my file and I'm trying to process with the 4th and 5th column:

Server3 has 61 PG Plan1
Server3 has 29 PG Plan6
Server4 has 18 PG Plan4
Server3 has 21 PG Plan2
Server6 has 31 PG Plan8
Server8 has 12 PG Plan3
Server3 has 10 BG Plan7
Server5 has 45 BG Plan5

This shows fine (logically):

awk '{print $4, $5}' file

Output:

PG Plan1
PG Plan6
PG Plan4
PG Plan2
PG Plan8
PG Plan3
BG Plan7
BG Plan5

But when I try a for loop, all are printed in the same line:

cat file | while read line; do echo $(awk '{print $4, $5}'); done

Output:

PG Plan6 PG Plan4 PG Plan2 PG Plan8 PG Plan3 BG Plan7 BG Plan5

I tried these but I still see the above output:

cat file | while read line; do echo $(awk '{print $4} {print $5} {printf "\n"}'); done
cat file | while read line; do echo $(awk '{print $4, $5}'); done

How can I print two columns of 4th and 5th together in the same line and then print a \n new line for another loop?

Expected output is:

PG Plan1
PG Plan6
PG Plan4
PG Plan2
PG Plan8
PG Plan3
BG Plan7
BG Plan5

Update 1

As asked in the comments why not using awk '{print $4, $5}' file when it works and shows expected output, the goal is to compare to files and if they match, do something.

This is file (which stated before here):

Server3 has 61 PG Plan1
Server3 has 29 PG Plan6
Server4 has 18 PG Plan4
Server3 has 21 PG Plan2
Server6 has 31 PG Plan8
Server8 has 12 PG Plan3
Server3 has 10 BG Plan7
Server5 has 45 BG Plan5

This is anotherfile:

-
  gpid: 46
  gpname: "Some MadeUp Name (Not Important)"
  pid: 308
  name: "PG Plan1"
  monthly: 100.00
-
  gpid: 46
  gpname: "Some MadeUp Name (Not Important)"
  pid: 308
  name: "PG Plan6"
  monthly: 187.00
-
  gpid: 46
  gpname: "Some MadeUp Name (Not Important)"
  pid: 308
  name: "PG Plan4"
  monthly: 155.00
-
  gpid: 46
  gpname: "Some MadeUp Name (Not Important)"
  pid: 308
  name: "PG Plan2"
  monthly: 125.00
-
  gpid: 46
  gpname: "Some MadeUp Name (Not Important)"
  pid: 308
  name: "PG Plan8"
  monthly: 225.00
-
  gpid: 46
  gpname: "Some MadeUp Name (Not Important)"
  pid: 308
  name: "PG Plan3"
  monthly: 140.00
-
  gpid: 46
  gpname: "Some MadeUp Name (Not Important)"
  pid: 308
  name: "BG Plan7"
  monthly: 200.00
-
  gpid: 46
  gpname: "Some MadeUp Name (Not Important)"
  pid: 308
  name: "BG Plan5"
  monthly: 176.00
-

The final goal (I'm going step-by-step but I don't know yet the command to reach below):

> for every line in file and column 4 and 5, check if the name == to the name in anotherfile, then multiply the 3rd column of file by monthly in anotherfile and calculate the result of each one.

Expected output:

Server3 has 61 PG Plan1 (profit 6,100)
Server3 has 29 PG Plan6 (profit 3,625)
Server4 has 18 PG Plan4 (profit 2,790)
Server3 has 21 PG Plan2 (profit 2,625)
Server6 has 31 PG Plan8 (profit 6,975)
Server8 has 12 PG Plan3 (profit 1,680)
Server3 has 10 BG Plan7 (profit 2,000)
Server5 has 45 BG Plan5 (profit 7,920)

Addressing OP's first/original question re: using a while/read loop to process lines and display the 4th and 5th fields ...

Assumptions:

• OP needs both $line as well as the 4th and 5th fields (from $line) for some (as yet undefined) purpose within the while loop, otherwise a simple one-line awk script would be easier/faster for printing the 4th/5th fields

One approach:

while read -r line
do
    read -r f1 f2 f3 f4 f5 rest_of_line <<< "$line"     # split $line on spaces placing contents in variables f{1..5} and rest_of_line (just in case there might be more than 5 fields)
    echo "$line : $f4 : $f5"
done < file

NOTES:

• this eliminates the unnecessary use of cat
• this elimnates all subshell invocations (eg, cat file | , $(awk ...))
• this allows other variables to be populated insided the while loop and then used later in the script (outside the while loop)

This generates:

Server3 has 61 PG Plan1 : PG : Plan1
Server3 has 29 PG Plan6 : PG : Plan6
Server4 has 18 PG Plan4 : PG : Plan4
Server3 has 21 PG Plan2 : PG : Plan2
Server6 has 31 PG Plan8 : PG : Plan8
Server8 has 12 PG Plan3 : PG : Plan3
Server3 has 10 BG Plan7 : BG : Plan7
Server5 has 45 BG Plan5 : BG : Plan5

If OP does not need the contents of $line then we can combine the two read commands:

while read -r f1 f2 f3 f4 f5 rest_of_line
do
    echo "$f4 : $f5"
done < file

This generates:

PG : Plan1
PG : Plan6
PG : Plan4
PG : Plan2
PG : Plan8
PG : Plan3
BG : Plan7
BG : Plan5

$ cat tst.awk
NR == FNR {
    if ( /^-/ ) {
        name2monthly[tag2val["name"]] = tag2val["monthly"]
    }
    else {
        gsub(/^[[:space:]]+|[[:space:]]+$/,"")
        tag = val = $0
        sub(/:.*/,"",tag)
        sub(/[^:]*:[[:space:]]*/,"",val)
        gsub(/^"|"$/,"",val)
        tag2val[tag] = val
    }
    next
}
{
    printf "%s (profit %7d)\n", $0, $3 * name2monthly[$4" "$5]
}

<p>

$ LC_ALL=en_US.UTF-8 awk -f tst.awk anotherfile file
Server3 has 61 PG Plan1 (profit 6,100)
Server3 has 29 PG Plan6 (profit 5,423)
Server4 has 18 PG Plan4 (profit 2,790)
Server3 has 21 PG Plan2 (profit 2,625)
Server6 has 31 PG Plan8 (profit 6,975)
Server8 has 12 PG Plan3 (profit 1,680)
Server3 has 10 BG Plan7 (profit 2,000)
Server5 has 45 BG Plan5 (profit 7,920)

The above is first creating an array of tag to value pairs (e.g. tag pid maps to value 308 in every record) for every line in the current --separate record of anotherfile, then creating an array name2monthly that maps every name value to the monthly value in that same record at the end of each record.

Then it reads file and just multiplies $3 by the monthly value stored in name2monthly[] for the given $4 $5 name pair.

It looks like the echo and the $line variable get lost the way they are used in the question. This should work:

cat file | while read line; do echo "$line" | awk '{print $4, $5}'; done

If a subshell is absolutely necessary, this should work too:

cat file | while read line; do echo $(echo "$line" | awk '{print $4, $5}'); done