You can add a reference to any join index. You do this, for example, when you create a new reference that you want to include in an existing join index.
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Select to open the List of Join Indexes.
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Select a join index in the list, and then click the Properties tool to open its property sheet.
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Select the References tab, and click the Add References tool to open a selection box listing all the available references in the PDM. Select the appropriate reference in the list and click OK to add it to the join index:

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Click OK in each of the dialog boxes to complete the addition of the reference to the join index.