In order for students to be available for Transfer in to Options they must be in a Band in the New Year.
This is often an issue is a student joins the school after the main bulk of students have been Transfered to Options.
Check the following steps
The students are entered in the current year in SIMS.net
Run the Promotion from Routines>School>Promotion (this can take some time to run and it is often advise able to run this at the end of the day)
Go into the new year via Tools>Academic Management>Set Academic Year
Go to Focus>School>Academic Structure>Academic Structure by Scheme search for the year group the student will be in and ensure that they are allocated to a Band.
In Options run the Student Import from FocusMenu>Tools>Transfer>Import Students or Process Menu>File>Import>Students