How do I charge GST and PST separately on a customer invoice

Using SAGE 50C Premium, Need to charge PST and GST on a Receivable invoice.  New tax code for PST (Saskatchewan) has been set up.

When creating an invoice I enter the dollar amount and when i click to pick the tax code I can only select either GST or PST.  How do I select both as this customer needs to be charged both GST and PST and the amounts need to show separately on the invoice.

Is there a way to choose 2 tax codes in order to bill the correct amount of tax?