On any entry in the stock grid you can use the Stock Select screen (ellipsis beside the stock code [...] or F5) to show availability of that stock in your default location. You can also select an alternate stock location, using the Location drop-down list.
If you have multiple stock locations and are adding stock to a job, you can view available stock from a different location on the fly. By default, users are linked to one specific location when selling. As you add quantity to the stock grid, Jim2 will calculate the available stock from that location. However, if there is insufficient stock in your default location, you can view stock levels in alternate locations.
Further information: