You can create a join index or a bitmap join index from the Join Index tab of the table property sheet. The join index is automatically based on the current table.
        
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                Open the property sheet of a table and click the Join Index tab.
            
 
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                Click the Insert a Row or the Add a Row tool to add a join index.
            
 
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                [optional] Click the Properties tool to open the join index property sheet and check that the Base table box is initialized with the selected table.