Can i manually upgrade a custom made system within warranty?

[rottedrabbit]

So a friend of mine is looking to get into PC gaming, and i suggested he order a custom built ryzen 3 2200g PC with no dedicated graphics aside from the on board Vega 8, and then buy a dedicated GPU a few weeks later due to finance reasons. I would then install the GPU for him.

Would I be voiding the warranty of the system doing this, or does it cover self done upgrades? Thanks.