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Step 1- Open RDMP and select 'Catalogues' from the horizontal menu and a list of catalogues will show in the left hand pane.
Step 2 – In the left hand pane right click next to catalogues and expose the menu, Select 'Favourite'
This will show the Favourite Column.
Step 3 – To mark a catalogue as a favourite. Click on the star in Favourite column and you will note the catalogue will disappear. Select Favourites from the horizontal menu and the catalogue and any other marked items will appear there.