Revit®| Multiple Cut

Adds a cut 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 cut 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 cut will not stretch the structural member to the model line, but only subtract the part of the member(s) on the opposite side of the cutting plane.