How can I hard-link tasks?

Currently linked tasks will be shifted backwards if their predecessor task takes longer (or is shifted backwards itself). This is applied to the whole critical path and works very well.

I do not find a feature though to apply this "whole path shifting" also when the predecessor task is finished earlier than expected: As long as the following task(s) are defined only by their duration and the end time of their predecessors, they should shift as well? How can I "hard-link" the tasks so the time between end of A and start of B does not change (workdays only, apart from weekend days)?