How do I put multiple parts into one tool?

I'm trying to make a tool but I need to put multiple things in it. I create the Part I wish to use as the tool and I name it "Handle", next, I insert a "Tool" into "ServerStorage" and drag my Handle into the Tool and then rename the tool to whatever I want. How do I put multiple Parts into one Tool?

You can make your tool model in studio with multiple bricks, put those bricks in a Tool object, and make sure that one of those bricks is the Handle. In order to prevent the bricks from dropping to the ground or flying off, I recommend welding the bricks this will attach the bricks to the tool's handle. There is a plugin called "Simple Weld" which does the job for me easily, you should use it.