Select a project on the left under Project selection and then select the Links tab on the right under Settings.

PARTproject -> Settings -> Links tab page

In the Links [Links to parts] dialog area, click on Parts on [Links to parts] the New button.

-> An Explorer window opens.

Select the desired accessory and confirm with Open.

-> The accessory is entered in the dialog area.

Update the index and open the part in PARTdataManager or 3Dfindit.

In the Links docking window, select the Accessories list box option.

-> The part declared in PARTproject the part declared as an accessory is displayed.

PARTdataManager > References [Links] > Accessories

3Dfindit > Accessories