Hi aspirant
This option allows you to accept the seat, but leave the option of upgradtion open.  float option gives you the scope of upgrading to a higher preferred academic program in any institute.

• Once  you are alloted seat   then you have to report at RC for document verification.
• If you want to change your option from floating,slide or freeze then you have to report at RC.

the dates will be out soon
Here, click on the below link to know more
https://engineering.careers360.com/articles/upsee-counselling/amp