At level 2 you should be able to use the parts to upgrade objects.
Here you have an example how that looks on a sink:
@boarderlinecris, in addition to what @Phantomlover1717 stated, I just wanted to add that upgrading your plumbing (and electronics with higher Handiness skill) can be valuable. 😎 They can reduce the amount of breakage, or keep the item from getting dirty, or give a beneficial moodlet when using the item. 🙂 For electronics upgrading can also allow you to get a couple more radio or TV stations. 🥳 There are different upgrade parts: a general upgrade part, plus upgrade parts for plumbing, kitchen, and electronics. If you don't have enough of a certain kind of part, you can always order more (for a price) on the computer under "Order...".
Also, whenever you repair an object, there will be a little pile of trash (if you have enough room for it) -- if you have a Sim dig through that trash pile, they can find even more parts, for free! :eahigh_file: After you dig through it once, you can then throw it away.
