The Segment Distal End Position can be resolved into any segment coordinate system.

For example, to compute the location of the distal end of the foot relative to a Virtual Lab], set the segment to be the foot and the reference and resolution coordinate system to be the Virtual Lab.

To compute the location of the distal end of the thigh relative to the proximal end of the shank and resolve the signal in the shank coordinate system.

Compute Link Model Based Signals has a model based item property labeled “Seg_Distal_Joint”. If you select the “Segment”= thigh, the “Reference Segment”= shank, and the “Resolution Coordinate System”= shank, you will get the answer you are looking for.