Creating subroutines within subroutines

Many times we have to code within subroutines (e.g. user exits for Sales). At time pieces of logic are reusable or can be abstracted into subroutines.
How can we create subroutines within a user exit subroutine? Or is there another way, perhaps an INCLUDE? Although I am a little wary about using INCLUDEs. Here is why
If condition 1
   If condition 2
     Logic1
   Else
    Logic2
Else
Logic1
Endif
Currently I would rewrite the entire code for Logic1 twice in the subroutine. This is the issue I am trying to resolve. Thank you.

It works if you do something like this
report prog1
include include1
form form1
perform task1
endform
INCLUDE1
form task1
endform.
But it will not work if you try something like this out
form form1
include include1
perform task1
endform

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