The essential steps to create a collection are:
On the Model tab, select Collections in the Model pane.
Click
, or click the down arrow and choose the collection type.
Enter the name of the collection.
Click OK.
A tab will open for you to edit the collection.
Click
.
Enter the name of the field and select object data type.
Click the arrow icon left to the field name.
Click
and define the item.
Click
.
Enter the name of the field and select object data type.
Enable Is Array.
Click the arrow icon left to the field name.
Click
and define the item.
Click
.
Enter the name of the field and select (Predefined Object) data type.
Choose the predefined object.