How to set up VAT for a second country

Hello All, I'm in the US and set up QBS Pro UK for our German office and I added the last few years of historical data. Now my CFO wants to start filling and reclaiming VAT for our Vienna office. I used the Manage VAT to create another tax agency and another accrued tax account. What else do I need to do? My supplier bills and customer invoices only have one VAT field. How do I map it to the correct VAT account? I am thinking that I need a second set of VAT codes. I am new to VAT and want to make sure that I am doing this correct. Please let me kow how to set this up. Many thanks for all your help in advance. Take care, Anne