In Reporting and Analytics, click Admin, click Warehouse, click Hotel Master Items, and then click the item category for which you want to configure a Master Item.
Click Add, or select an existing master item and click Edit.
Configure the Master Item:
Configure the Name and select the Master Group from the drop-down list.
If the item category includes parent master items, select the respective Master Items. For example, the Room Category Master Item has a parent Room Class and parent Rate Category.
Do not change the PMS Ref. Reporting and Analytics generates the reference ID.