The problem with your desire is that you are neither paying or charging GST to the employee (yourself in this case), so Manager’s built-in tax calculation feature cannot be used because it will throw off the built-in tax calculations and reports. If you insist on tracking this, I think the way to do it is to create a separate expense account named something like
GST paid on expense claims and add the tax as a separate line item in the expense claim. Manager will treat this like any other expense account, such as
Supplies and not mix it with the built-in control accounts. Depending on your tax jurisdiction, knowledge of GST paid may be useless.
This is the person/merchant/hotel/airline or whoever the Payer gave money to for the business expense.
This cannot be, because no company funds are being spent. An expense claim records a liability of the company to the payer for money already spent. Spend/Receive/Transfer Money can only occur in cash accounts. If you find this confusing, you might now understand why it is poor practice to pay business expenses from personal funds. This is why tax professionals always recommend separate business accounts. One way to simplify some of this is to have a petty cash fund for the business so you don’t have to involve the payer.
I disagree. Recording the purchases is no more complex. To properly allocate the various purchases to the correct accounts, you need to enter each as a line item somewhere, so why not do it properly as an expense claim? And you now need to enter only a single-line clearing transaction to either reimburse yourself or transfer the liability to owner’s equity. The difference between what you were doing before and this proper use of Manager’s features is only which transaction includes the line item details.