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Hello, I am new to AutoCAD this year, just started an internship for the summer that uses it heavily. I am using AutoCAD P&ID 2015 while the drawings I am receiving are from a user who has 2007 or 2010 classic (NOT P&ID). The problem I am having is almost exactly the same as this post: http://www.cadtutor.net/forum/archive/index.php/t-2531.html However my drawing does not contain a layer with xref in the name. I am trying to select some line segments and either move or delete them but it will not let me. Most of the lines in the drawing can be selected, moved, deleted, but some cannot. When I click the lines that can't move it does not display the grips but it does become a dashed line, like its partially selected or something. idk if the history of this drawing matters but it was orginally created on a P&ID version of AutoCAD and exported so it could be opened and edited by others with an AutoCAD classic version. After all of this it was sent back to me, which I am editing this drawing now with the workspace set to Drafting & Annotation. Let me know if I have not provided sufficient information needed to solve this problem. I would really appreciate any inputs or suggestions you may have.