AutoCAD has a great feature for removing doubled up or overlapping lines. Select all the objects in your drawing or just the objects you wish to combine.
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Then from the Modify menu select Delete Duplicate Objects. Ensure the Optimize polyline segments option is checked. If you have "do not break polylines" checked the feature will not break native shapes such as square etc.
Uncheck this option to ensure all the duplicates are removed. The default, 0. You can change this to 0, to delete only objects that are exactly on top of each other. The "Optimize polyline segments" check box, on by default, removes duplicate line or arc segments within a polyline, or lines and arcs that overlap a polyline. If you uncheck this, the command only removes duplicates of entire polylines. The "Combine co-linear objects that overlap" check box, also on by default, combines objects that partially overlap into one object.
The real challenge is when you have blocks with the objects inside it have different Z value. You will need to open each block in block editor and change the Z value using the procedure above.
Change block insertion point WITHOUT altering the location of already inserted blocks
I know this can be a tedious task. But if you need to continue working on this drawing, I suggest you fix it. If you only with 2D drawing, it is a good idea to set Object Snap to ignore Z value. It will not fix existing drawing, but at least you will not having a bigger problem.
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Yes, sometimes the variables are changed in a mysterious way. If you are adventurous, you can add the default System Variable in acad. It will make sure the variable is set when you start AutoCAD.
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But it never works well for this issue. Before you continue, create a backup of your drawing! You may want to try them both and see which one works well for you. We need to change the Z value for our objects to 0 zero. Open Properties Palette. Because we select multiple types of objects, we will not see the Z or elevation properties here. Repeat the procedure for other object types. Here are several fields that control the elevation.