ways to separate totals for tax and non-tax items at tender time ?

I am using Microsoft POS 1.0 and a new user. I want to be able to show two separate totals for tax and non-tax items at tender time. Is there a way to do so within POS or do I need to write an add-in ?

I am also surprised that I can't even sort per selected column which is often implemented in similar design by clicking on the column's title. At least that way, I can sort tax and non-tax by clicking on the tax column.

Thanks in advance for the help, Sea