When in Main Form Definition you can manage and create Custom fields. This can be done by clicking the Advanced drop down menu at the top right of Main Form Definition window and selecting Manage Custom Fields.
This will bring up the Custom field window. Here we can double click on existing Custom fields to edit them or create a new Custom field by clicking the “+” icon.
After clicking the “+” icon you will be brought to the New Custom Field form. Select your desired Editor Type and then give it a title or other pertinent information depending on what Editor Type you selected. Click the floppy disk icon to save the Custom field.
To add the Custom field to the form you will right click on any row/column on the Form and select Add Field. The Available Fields window will appear.
From here you will find your newly created Custom field under the Editor Type you assigned to it. Add your Custom field to your desired row/column on the Form by dragging and dropping it.
For the changes to the Form to save you will need to click the save icon at the top right of the Main Form Definition window.