Everything in the catalogue sits in an item group. The group holds the items and defines the fields they have.
Create it
- Open the project.
- Click New item group and name it after what it will hold, Fabrics, Legs, Sofas.
- Save, then add its fields.
One group per kind of thing
A group is a shape, not a folder. Fabrics and legs belong in separate groups because they are described by different fields, even if they end up on the same sofa.
Once two kinds of thing share a group, every item carries every field, and half of them stay empty.
What to reuse
Troubleshooting
I cannot see the group in another project
Groups belong to one project. Copying a whole structure into a new project is a separate operation: duplicate the project rather than rebuilding it by hand.
Two groups hold nearly the same thing
That usually means one field distinguishes them and it should be a List field inside a single group instead. Merging is manual, so it is worth deciding early.