Hello Kim,
As per my understanding, you want to change the positions of the models that you place in Mechanics Explorer (SimScape).
You can change the position of the links using the "RigidTransform" Block. This block applies a time-invariant transformation between two frames. You can attach the Base Link of the second robot with the "WorldFrame" Block using the "RigidTransform" Block. You can further set the transformation value (Rotation and Translation) in the Block Parameters of the "RigidTransform" Block.
Please refer to the documentation on "RigidTransform" Block for more information:
Additionally, you can also refer to the following documentation on modelling a simple link:
