First you have declared your variable but you have not made it public so it is only available to its host macro.
For other macros to be able to use it you need it to be public and at the top of a normal Macro Module.
Ok assuming you declare your variables as Public, they will be erased each time you close your worksheet.
So if you want to keep them then save them on a worksheet, either in a cell or as a name.
click on Formula and then name manager to create your name.
Save your workbook when you create your name and it will be saved too.
Once you have done that you can use denominator in your formulae.
type this into a cell:
Bookmarks