Void needs to move as length is adjusted.

[jjohnsTDCKW]

I have an extrusion with mounting holes at each end. When I change the length, how do I lock the mounting holes to move with the extrusion?

[ToanDN]

Constrain the hole centerline ref with a locked dimension to the end ref plane.

[jjohnsTDCKW]

I could not get a snap on the void to add a dimension or anything that I usually use

[ToanDN · Accepted solution]

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@jjohnsTDCKW wrote:

I could not get a snap on the void to add a dimension or anything that I usually use

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How did you create the void? 

- If it is modeled as a void extrusion in the same family then edit the sketch, select the circle, show center point, constrain the center point to the end plane with a dimension and lock it.

- If he void is a separate face based family then you should be able to place the dimension from its reference plane to the end plane and lock.