"variable" to make Macro not associated with one specific sheet in workbook

Hello,

I am recording a macro program in order to pull specific data points out a spreadsheet in excel. Currently the beginning of my macro looks like this:

Range("G20").Select
Selection.Copy
Sheets("Sheet1").Select
Range("C3").Select
ActiveSheet.Paste
Sheets("An32 CD45").Select

My problem comes with that last line of text. Does anyone know how I can insert some kind of variable or line of text that doesn't make this macro work only on sheet "An32 CD45" I want it to be able to pull the numbers from any page I ask, but when I try to run the macro on another page is still only pulls the numbers from "An32 CD45." Thank you for any help you can give.

Liz