Revit® | Multiple Stretch

Adds a stretch to structural member(s).
The cutting plane can be defined with a model line.
The plane will be perpendicular to the work plane of the model line
You can stretch a structural member with either existing model lines or draw new model lines.

Insert

Select the structural member(s) on which the tool should be applied. Select a model line or press <enter> to create a model line by selecting 2 points.
As a last step, select the side of the structural member(s) to be preserved.

Be aware that the stretch will remove all other end cuts on the selected side of the stretch.