To Create 2-Axis Chain Dimensions (AutoCAD Mechanical Toolset)

Click Home tabDimension panelPower Dimension drop-downMultiple Dimension. Find
In the Automatic Dimensioning dialog box, Parallel tab, from the Type list select Chain.
Select the Both Axes check box.
Verify that the Display dimension text editor for every dimension check box is cleared.
Select the objects to dimension, and press ENTER.
Specify the extension line origin (1) for the first axis.
Specify the extension line origin for the second axis.
Specify the dimension line location for the first axis (2).
Press ENTER to finish dimensioning the first axis.
Specify the dimension line location for the second axis (3).
Press ENTER to finish dimensioning.