Once the measurement references have been selected, you must select dimensions from the Creo Parametric model that define the dimension loop. The dimensions that you select must be parallel with the measurement direction and define a 1-dimensional loop from the first measurement reference to the second.

To aid in the selection process, the candidate dimensions are automatically displayed in Creo Parametric. Starting with the first measurement reference, the dimensions belonging to the part that are parallel to the measurement direction and whose endpoints are aligned with the measurement reference are displayed. When you select a dimension, the next set of candidate dimensions are displayed (dimensions that are parallel to the measurement direction and whose endpoint is aligned with the endpoint of the previously selected dimension).

Once you have selected all of the pertinent dimensions of the first part, click the next part in the loop. The candidate dimensions for that part are displayed. You continue this process until you have completed the dimension loop

Once you have selected a dimension on the final component whose endpoint is aligned with the second measurement reference, the loop is complete and the selection process ends.