Custom connection custom fields and categories are created via the control panel settings (permissions required to access the control panel).
Access the Control Panel via the cog icon in the main menu bar > select Custom Connection Types > select the desired connection on the left of the screen > select Edit Custom Fields on the right of the screen.
Custom connection custom fields are stored underneath categories. The Uncategorised category is a system default category available to use if needed. Categories display as tab headers in the Add Individual or Organisation windows.
Click the Add button in the top right corner of the screen to add a category. Define the category name according to the business requirement for that connection.
Use the same Add button to select a custom field type to add within the category. A combination of similar or different custom field types can be used within each category type. Choose one of the Text, Number, Select, Multi-Select, Date and/or Time, or Lookup field options from the Add drop-down. Then use the Category drop-down to assign that custom field to its respective category. By default, all custom fields are assigned to Uncategorised if one is not assigned.
Use the option to drag and drop custom fields and categories to arrange their placement. The Add Connection window will display categories and fields in the same order as laid out in the control panel settings.