HOW DO I ADD A NAME TO A GROUP

I grouped my columms in excel

for ex.

group one is columm A & B & C

group twoo is D & E & F

etc.

Now I would like to give a name to each group so in stead of the "+" to have
a name .. Gina, Lisa etc ..

Do you know how to do it or it's this a whisfull thinking?!

Highlight the cells you want in a group, then name that group in the box to the left of the formula bar. Now this list name can be used for additional formulas.