A catalogue is the main folder for storing and creating catalogue, catalogue related pictures, object types, categories,and category trees
Here are the steps in creating a catalogue
Step 1

Click on the catalogues tab
Step 2

After you've clicked on the catalogues tab, you will be sent to this page, Now click on the add new catalogue
Step 3

Now give the catalogue a name, description ,and pick on the project where you want this catalogue to be used.
After that press save
Step 4

After saving you, you will now see the catalogue that you have just created in the list of catalogues