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Thanks @maxim_k
This is not quite what I am trying to do. I am trying to lock the insertion point of the xref to a line or point on the inserted drawing.
Very simplified explanation of what is happening:
1. "dwg B" is xref'd into "dwg B"
2. dwg B has a 1x1 box drawn in it
3. I insert lets say at 0,0,0 as required. 0,0,0 of each drawing aligns perfectly. the box sits nicely in the corner of a room to the bottom left of the room, with a wall horizontally and vertically from point 0,0,0. I clip the xref so the rest of the drawing is not visible and I have a nice neat insertion. So far so good, everything lines up and is clipped correctly.
4. 1 month later the client changes something, and the box becomes 1.2 x 1.5 in size but gets bigger to the left i.e. negative X co-ordinate direction, and down - i.e. negative Y co-ordinate direction
5. when I update the xref, I need the bottom left point of the box to be in the same position, but the box is now not aligned with the UCS of dwg B due to the size change. When this updates in dwg A, I then have to move and adjust the xclip so that the bottom left of the box is still locked to the same position in dwg A.
6. While I understand the box can be moved in dwg B before updating the xref, this is the same as moving and re-clipping the xref in dwg A and either way is laborious with multiple complex drawings. Is there a way to insert and lock the two drawings so that no matter what I do in dwg B, the insertion point always relates to the box (or block if that works better) bottom left corner. No matter how much a adjust the box.
Hopefully that makes sense? Perhaps it is a little too advanced or complex for AutoCAD....