Selecting the Reference Features You select reference features to use as origins for location dimensions. Manufacturing and inspection use these features for part setup or to position the part within an assembly. In the PropertyManager, under Reference Features, click Primary Datum. Select the right face as shown. Right-click when this pointer appears to advance the selection to the next datum. Click Secondary Datum. Select the face of the top plane. Click Tertiary Datum. Select the face of the front plane. Parent topicDimXpert Tutorial Overview Previous topic Setting the Part and Tolerance Type Next topic Selecting the Features to Dimension