This creates a ring of fold up tabs on the inside of holes for fixing a branch to a pipe. The tabs will always fold back to the required hole size, including any hole size adjustments that may have been included.
To access and amend the settings Click on File 
Setup Database Fittings clickPattern Options or select the Database icon from the Utility Bar.
The settings for the tabs are controlled by the group labelled Castle Holes.
Length
The length of the tab that will stick up from the pipe.
Width
The width of the tab at its base.
Angle
The angle of the gap between adjacent tabs.
The next stage is to ensure that the Castle Holes option is included on the item list at Takeoff time. Double-click on the item that you wish to add to the job when at the Utilities > Item Folders menu, and go into Takeoff > Customize and click the Item Information tab. The Customise Main Takeoff screen will show, and if you highlight the Castle Holes field on the left hand pane and click the right-pointing arrow, the field will be copied to the right hand pane. You can then use the up and down arrow icons to change the order of the display of the field.
When taking off or editing a fitting, the use of tabs is determined by the Castle Holes checkbox on the Item tab of the Takeoff screen.
