Dimension Overdrawn Dialog Box (AutoCAD Mechanical Toolset)

This dialog box displays if you place a dimension in such a way that it overlaps an existing dimension. Use this dialog box to arrange the overlapping dimensions appropriately.

Replace

Deletes the existing dimension and replaces it with the one you insert.

Break up

Splits up the existing dimension into two dimensions, and arranges those dimensions into a chain dimension type.

Move away

Arranges the existing dimension and the newly inserted dimension into a baseline dimension type.