@tlyles My understanding is you will need to know what the ELL fields are for your SIS and state. For example in Nebraska...S_NE_STU_LEP_X.ELL_Partic=1 is a search I conduct to find my students participating in our ELL program.
Unless you know the fields, you can't do any searches.
@tlyles Codes like that will be state specific codes. If you click on "Help" from your PS SIS main screen > State Reporting Help > Data Dictionary > Common Tables.