Trending @Wipro; Revert leave balance in EBLP(LOP)

I got notice from HR that EBLP starts shortly and he didn't reveal me the date. I know that I can use the leave balance to get the salary.

But I have below questions:

1. Can I use both wellbeing and annual leaves to get the salary? Or I can use only annual leave?
2. If I use the leave balance (I have 10), if I get the project before 10 days(in my case), will I get the remaining balance back?