To Place Association Points

Do one of the following to turn on the Association Lock:

Select Drawing > Drawing Aids > Locks dialog launcher.

or
Click the Locks icon in the status bar and select Association.
If using the Element Dimensioning tool, place the dimension normally.
The Element Dimensioning tool creates all possible associations automatically if Association Lock is on. Snapping is unnecessary. If using dimensioning tools other than Element Dimensioning, snap tentative points to the element or elements being dimensioned to create associations.