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Open up a new SolidWorks Drawing
Once SolidWorks opens, select the "New" button in the top right. Select "Part". -
Creating your parts
Create the two parts that you want to make. In this case it is a water bottle. -
Assemble the Parts
In the toolbar menu you will choose the option "Assembly". There is two options for mate types: concentric & coincident. Choose "Coincident". Select the parts you want to assemble.