How to craft orange, yellow and purple parts?

To craft the higher level parts you will need to produce the higher level materials. You can make these by combining together lower level materials in the parts factory. Tap on the Depot option and then select Materials to see what you have and then combine them.

You can also buy materials chests that give random materials in the Material shop option of the Parts factory with energy fragments, or using diamonds in the main item store.

You will need a lot of low level materials to combine to get the higher levels ones.