1. Make sure that the irrigation controller you want to work with is displayed in the BaseManager footer. To select a different controller, click the "Menu" icon 
in the upper-left corner of the BaseManager page, and then click "Sites and Controllers". Continue drilling down until you can select the desired controller.
2. Make sure the zones that you want to assign to the mainline are configured. Refer to Updating Zone Details.
3. Position the cursor on the "Flow Setup" tab, and then click "Mainlines" in the menu that displays.
4. In the Mainlines list, click in the row for mainline that you want to assign zones to. The "Mainline" page displays.
Note
To return to the Mainlines list, click the "<" arrow in the upper-left of the "Mainline" page.
5. Click the "Edit" button in the lower-right of the BaseManager footer. The Mainline fields become available for editing.
6. Scroll to the bottom of the screen and expand the "Zone Assignment" section.
7. Click "Add Zone". The Zone number field displays.
8. Click the drop-down arrow in the "Zone number" field, and then click the number of the zone that you want to assign to this mainline.
9. Click in the "Design Flow" field and type a number to represent the gallons per minute flow for this zone.
10. Repeat steps 8 and 9 to assign all the necessary zones to this mainline.
11. When you finish making changes to the Mainline, click the "Save" button in the BaseManager footer.