This video shows how to modify parts by deleting points.
Please note that this video only applies to Tekla Structures 19.1 and older. The Modify command was replaced with Direct modificationfunction that activates the mode where the model objects can be modified by using handles
Direct modification enables additional handles and modification options.
in Tekla Structures 20.0. See the video on how to use direct modification, or read the instructions in the product guides.