I must include 3 fixed tax on subtotal, can you help me?

I must include 3 fixed tax on subtotal, can you help me?

Hello everyone,
I have a problem, I have to insert 3 fixed fees on my bills, for example:

SubTotal: € 1600.00 (this is the total of my articles)

Then in the final part of the bill I must add that my taxes are fixed:

SubTotal € 1,600.00
----------------------------------
PASSING INPS +4% € 64.00
TAX € 1,664.00
+20% VAT € 332.80
Invoice Total € 1,996.80
Withholding 20% € 332.80
-----------------------------------
Total € 1,664.00


and therefore the total that my client has to pay:
Total: 1664.00

I have to enter it, but how do I do?
I created these taxes as Stacked, but not counted,
could you help me?

thanks