Cancel order and add more part

Domeevo

How can I cancel and add more part (same store)?

Stragus

If you only want to add more parts, place a new order and it will combine the shipping (as long as the first order isn't yet processed/shipped).

To remove parts though, send a message to the seller.

ScorpionReaver

Oh, that's very helpful, thank you!
I was wondering the same thing, myself.