excel - Building a string and using it as the function array name -

i'm not sure how or if can this... want build function name using "ap1", i'm able do, i'm getting "expected array" error. thoughts? i've been staring @ long.

here's piece of code:

dim ap range dim newnum0 string dim ap1 variant dim strswprog string dim strswtype string       if strswprog = "add port"          ap1 = strswtype & "_addport"      each ap in newrange          if ap > 0               newnum0 = ap               ap = ap1(newnum0)    'here's problem               ap.value = newnum0          end if     next ap     end if 

from comment:

the strswtype value dms100 , i'm adding "_addport" onto so, ap1 = "dms100_addport". i'm sending newnum0 value function called dms100_addport. there way without having set like: ap = dms100_addport(newnum0) send function?

to so, use application.run method:

ap = application.run(ap1, newnum0)