The visibility of [[Custom Fields]] can be controlled through values that are entered elsewhere on the page.
The concept is that one One [[Custom Field]] - the "control field" - is used to control the display of a set of [[Custom Fields|custom fields]] based on a value entered or selected in the control field. The set of [[Custom Fields]] to be shown/hidden must be located under a [[Custom Field Type: Title Bar – Multiple Columns|Title Bar]]. All fields between the specified [[Custom Field Type: Title Bar – Multiple Columns|Title Bar]] and the subsequent [[Custom Field Type: Title Bar – Multiple Columns|Title Bar]] will have their visibility controlled as a group.
The control field can be any [[Custom Field]] that contains a value:
* [[Custom Field Type: Lookup – External Entity]]
* [[Custom Field Type: Lookup – External People]]
