If you need to configure what lines are being shown by an iPad, you can do that in the iPad settings.
Go to the Locations section of your Dashboard and select the location for which you want to configure the iPad. Then click on the IPADS tab at the top.
Select the iPad you want to configure.
In the iPad settings, click on the field saying "Service A Service B".
The current settings will be displayed on the right. The lines you can see here will be shown on the iPad.
Search the lines you have already set up and select the ones you want to be displayed on the iPad.
To remove a line from this iPad-specific selection click on the "x" to the right of the line name.