I think I know what you mean… the macro is saved in a project; then if you create a new station you can open the project again and when you debug it this macro will be included in the VSTA User Add-Ins and you will be able to load it in the new station.
Sorry, even easier, no need to open the project, right button over the name of the project (it should be in VSTA User Add-Ins if you saved it) and Load Add-In…