You can define linear/linear coupler mates to set up linearly coupled motion between components in models.
To set up the linearly coupled motion between two components of an assembly, create a linear/linear coupler mate between the two components, and apply a linear motion element such as a linear motor to one of the coupled components.
When specifying the linear/linear coupler mate, you can set up linearly coupled motion with respect to ground or with respect to a reference component.