I need to consolidate monthly targets data for salespersons at my choice.
Details: I have a table with salespersons and their monthly targets, January through December. Sometimes I need to add specific months, for example January+February+March or July+August etc in a new sheet, using a form.
I need to use a form like this
to get this result
I have attached a dummy table.
I am too stupid to do this and I will really appreciate any help.