How to merge parts so that the outlines disappear

I am new to Onshape and I am making a torch body for my school assignment, however I can't really figure out how I will make my torch body, which looks like this.
But I've decided to make different parts for the torch body and then merge it together, and also make the bump at the bottom separately. However I'm not sure if it will work and I've started the very first bit but don't know how to merge the parts together so the outlines of the parts put together is not visible.

Please help as this is very urgent....Thank you.

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