sum of all "L" in cells

[ivan.985]

I'm from serbia and my english is very bad, but i can't find solution of my problem on my language!

I need to sum all letter L and all letters R in all sheets in sheet "Poručivanje okova"
When i in first sheet "K1-OK", in cell D32 choose option "Obradi" then in last sheet in cell C29 and cell D29 calculate how much letters L and R in anothers sheets in cells where writes "Donji falcni nosač na krilu" and need result need to be like 10L and 10R!

How can I put button in excell sheet to change option like in cell d32 in first sheet, when i click on button to be like i choose options "Obradi"!

Thanks a lot!