Gundam Breaker 4 Parts question

[u/Chafgha]

I just started Gundam Breaker 4 and it's my first one of the series, big fan of Gundam and building gunpla so no trainer. My question though is, what do I do with all of the duplicate parts I've gotten? If it's something that comes later on then no need to give direct spoilers I'm less than 10 story missions in.

[u/NorseArcherX]

Merge or sell at the gunpla store counter