You already have a few weeks or rounds/iterations played but you need to delete the rest of the schedule and create a new schedule for the rest of the session?
First you will want to manually delete the remainder of the schedule.
Then make the proper changes (ex: removing the drop out team from the division for example)
View the check list in the following link and help guide to Generate your new schedule.
Note: (You can use the Generating group you used at the beginning of league but make sure to change the dates to only have the ones you need from now until the end of league)
***Please note that the schedule will not take into consideration the first half of the schedule. The system will only look at the teams in the division and dates to create an as equal as possible schedule for Home and Away. Not overall but for that part of the schedule only.