When trimming a section part with another SolidWorks uses Weldment Trim.

When using this between 2 parts it tends to not rebuild with a deep level Control Q.

This function places a plane in-context in the part being trimmed and trims against the plane in the part rather than part to part.

This allows a rebuild at top level using control Q and allowing the part to update without editing the trim.

Trimming Weldments Sections must occur at the Weldment Assembly Level.

This will remove any chance of intectual relationships occurring between Weldment Member Assemblies.

● Using this function on the Menu Bar click TSDUtilities as shown below, then select the  Icon.

                                                                          ● Alternately use the  button located on the Command Manager Tool Bar under TSDUtilities tab as shown below.

                                                                                                                   Video Demonstration Link

                                                                                 Click this link to go to the TSDUtilities Toolbar TSDUtilities Toolbar