@ariellavy The simplest way is to just type the name in your routine. Below are two examples. The first example (#1 and #2) show how to call one from another. The second example (#3 and #4) show how to call one and also pass a parameter to another routine.
MsgBox "Hello, I'm #1"
MsgBox "Hello, I'm #2"
Routine4 "Hello, I'm originally from #3, but am now in #4!"
Sub Routine4(ByVal Message As String)