just say "return".

Whenever it is hit, it will return to last call.

Code:
carry_out_logic:

    if counter=4 then
        toggleme=~toggleme
        LED_4=1
        return
    endif

    if counter=6 then
        LED_6=1
        return
    endif

(...other if-then stuff...)


return  ' if nothing executed so far, it returns anyway.