Sentinel is a little cumbersome at setting alert lights for channels. There is a way to hasten this somewhat if there are numerous channels in the department.
In the Favorites List editing window, with a department open, you can set the alert light as desired in the top row. Then right click on the Alert Light cell, selecting Copy. Then select (highlight) the other cells the light should be applied to by either Control Click, Shift Click or holding the left mouse button down while scrolling down the column. Once all the desired cells have been selected, right mouse click and click Paste.
I set alert lights based on Service Type - blue for police, red for fire, etc. If I have a mixture of Service Types in the department, I'll do a sort based on Service Types to cluster them together for alert light setting purposes. After the alert light is set, I'll do my final sorting.
ARC 536 Pro has a feature to work on the Master Database on a computer. One of the things it will do is set the Alert Lights. However, this is still a multiple step process.