How to create an internal table with a types structure?

Hi experts,

I've 3 internal tables with the same structure, I think I could put a type structure and put that type inside the body of the internal data, is this possible? If true, how can I put that?

Example:

TYPES: Begin of type_s,

pernr like pa0001-pernr,

end of type_s.

Data: begin of itab_1 occurs 0,

¿¿¿??? reference to type_s

end of itab_1.

Thanks a lot,

Regards,

Rebeca