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If it's configured correctly, it should be able to calculate the prismatic joint correctly. If it's not, there may be something wrong with your configuration. I would be interested to see more of your tree organization, for example what is your base_link? Maybe there is some structure issue in why the tool isn't automatically calculating the joint.

What you need to define, and you can do this manually, is a prismatic joint between the linear track and its slider (blue thing). In SolidWorks, insert a reference coordinate system ("Insert">"Reference Geometry">"Coordinate System") at the start of the slider's motion, and insert a reference axis along the sliders direction of motion. When setting up the configuration, select the inserted coordinate system for that joint's coordinate system, select the inserted axis for that joint's axis, and select 'prismatic'. A prismatic joint defines a linear motion like you are looking for here.