I sometimes have to dimension several similar parts of varying lengths. Therefore it is convenient for me to dimension the longest one first, then copy that drawing and change the configuration. Hole patterns lose instances and dimensions and centerlines turn dangling. I'm having issues with dangling centerlines that I cannot delete because they are in the same position as active centerlines. No problems with dimensions because I know better than to dimension to centerlines and they are easily deleted with display / delete relations, but the centerlines cannot be deleted this way. Does anyone have any suggestions?