Hi @tinhnho ,
The PA-5260 supports 25 base virtual systems. The PA-3220 supports 1. https://www.paloaltonetworks.com/products/product-comparison?chosen=pa-5260,pa-3220
First, you would need to purchase a vsys license for the PA-3220. Second, you would create a new virtual system. Third, you will create separate administrator roles for each virtual system. Then, your customers can configure their vsys just like a regular NGFW. Vsys1 can continue to be one of those virtual systems. I think you will need to assign interfaces to each vsys before the customers can use them. It has been a while. You could go with separate physical interfaces or use trunk ports and assign different sub-interfaces to each customer.
Thanks,
Tom
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