A variable action can be used to move a specific text or image frame on a page in a customizable document. This is done by tagging the frame and then changing the x or y coordinate of the frame with that tag:

Select the frame in the document layout. Give it a name using the 'Tag' field in the Objects > Object Location pane.

Here are two examples for changing the x and y coordinates of this frame, based on either the value of a variable or a fixed value: