List of lists of series of number in C

I am doing a program that let's me take in input a dim number of series, any of them has got a name.
This is how I coded them:

struct lista // lista means list
{
    char nome[30]; // nome means name
    struct serie *serie;
    struct lista *prossima; // prossima means next
};

struct serie
{
    int n;
    struct serie *prossim;
};

I assigned this structs to make lista work in main() this way:

struct lista *inizio = NULL; // inizio means start
struct lista *list = NULL;
struct lista *precedente = NULL; // precedente means previous

How do I create struct to access struct serie *serie of list?
I thought of doing it this way:

struct list.serie start = NULL;
struct list.serie seri = NULL;
struct list.serie previous = NULL;

but it doesn't work.
How should I type it?
And how do I free memory?

with the struct list I do

list = inizio;
while (list != NULL)
{
    struct lista *pros = list->prossima;
    free(list);
    list = pros;
}
list = NULL;

and how do I free serie list?

I tried as in the previous example how I created serie structs by typing:

struct list.serie start;

etc... but it doesn't compile because it says Expected an identifier
For the deallocation I may apply the same way of how I did with the original list lista

I tried doing it without accessing to struct serie *serie, so only making the input of the name, so how I utilize lists seems to be OK because I can program a simple list, but a list of lists is the problem.

For anyone that want to see the entire code:

#include <stdlib.h>
#include <stdio.h>
#include <string.h>

struct lista
{
    char nome[30];
    struct serie *serie;
    struct lista *prossima;
};

struct serie
{
    int n;
    struct serie *prossim;
};

int main()
{
    int dim;

    struct lista *inizio = NULL;
    struct lista *list = NULL;
    struct lista *precedente = NULL;

    printf("How many series do you want to add? ");
    scanf("%d", &dim);

    for (int i = 0; i < dim; i++)
    {
        list = malloc(sizeof(struct lista));

        printf("Enter the name of the series: ");
        scanf("%s", list->nome);

        list->prossima = NULL;

        struct list.serie start; // THIS IS WHERE I GET THE ERROR
                                 // HOW DO I USE list.serie to create lists?

        if (i == 0)
        {
            inizio = list;
        }
        else
        {
            precedente->prossima = list;
        }
        precedente = list;
    }
    
    list = inizio;
    while (list != NULL)
    {
        printf("The name of the series is: %s\n", list->nome);
        list = list->prossima;
    }
    
    list = inizio;
    while (list != NULL)
    {
        struct lista *pros = list->prossima;
        free(list);
        list = pros;
    }
    list = NULL;
    
    return 0;
}

Kindly do show the error messages so we can have better understanding of issue.

Important things to note

1. NULL needs <stdlib.h> header
2. Pointers are accessed with '->' and not '.'
3. serie* serie is not a declaration of structure but a variable. So it can't be used instead of datatype

you can access series of list using list->serie

struct serie* temp = list->serie;