Customization in odoo14 OpenEducat Promotion of Students BatchWise

Customization in odoo14 OpenEducat Promotion of Students BatchWise OpenEducat Promotion of Students Batch Wise -1st year to 2nd year,2nd year to 3rd year, and 3rd year to pass out(moved from [login to view URL] class to [login to view URL] class) -and if the batch is BTTM is a 4-year course so it's promotion 3rd to 4th then 4th to pass out class) -Auto Generate of Invoice as per account head, & confirm along with the promotion of student (batch wise) -Those students invoice will remain in a draft state whose previous fees is pending (status of fees update in invoice fee status) Payment Plan selection while promotion of Batch (Student can itself select the available plan if empty and can only pay online if not empty payment plan)