To add GTPT unit to cabinet, follow these steps:
Select the partition to which you want to add the GTPT unit, and navigate to the left panel, and select the Partition tab.
In the left panel, select the Customize icon at the top.
Therein, against the Other Accessories option, select the +Add option.
In the carousel that opens, select the Baskets category, select the Wall Unit Accessory subcategory, and navigate to the Dish Rack thumbnail.
Click on the thumbnail to add the GTPT unit.
To access the added GTPT unit's properties and customize them,
Click on the GTPT unit, and navigate to the left panel
Select the Furniture/Light Unit tab in the left panel
The properties of the GTPT unit such as dimensions, positioning and materials, will open up in the left panel for you to customize
To delete the GTPT unit,
Click on the GTPT unit, and navigate to the left panel
Select the Furniture/Light Unit tab in the left panel
In the left panel, select Remove Furniture/Light Unit.