🚀 go-pugleaf

I have a question on Excel.  Is there a handy way of converting a
number (entered in data) into a reference?  Like a function,
say fun(20) which would return A20.  I can see perhaps how to
use a macro with the macro function offset to do it, but there
must be some easier way than that.  The application asks for a line number to 
be entered
from another worksheet and then I want to copy data from
that line.  There is no clean way to search the other worksheet
for the proper data without having a human look at it.