You can embed PIC® assembler code in subroutines and functions, as well as your main program code, by using an asm… end asm block. You can also declare local variables inside your subroutine or function and use them in you assembler code. For example,

Function AddTen(value As uinteger) As Byte
   Dim localVar As uinteger = 10
   Asm
   mov  localVar, WREG        ; local variable into WREG
   add  value                 ; add param variable  
   mov  WREG, AddTen          ; move WREG result into function result
   End Asm
End Function