Hi, anynone out there can help to answer my doubts?

Currently, I am using DG50, with 2 DG postpaid Family Unlimited supplementary plan under my account. (Note that all 3 mobile numbers here are actually billed under same account number)

I am interested in the new DG Family Prepaid Plan.

1. Am I able to change my 2 supplementary numbers from Family pospaid --> family prepaid plan? (I need to retain the same number) (Please advise on the proper steps)

2. If I make changes to the 2 supplementary numbers, will it affect my current bonus point?

3. The monthly commitment for prepaid plan is RM15, meaning that RM15 will be reload to prepaid plan every month,which follow my principal billing cycle. This RM15 valid for 1 month, meaning to say if I am not able to finish RM15 the remaining value can be brought forward to next month. Example, this month I used only RM8. So on beginning of next month, I will have RM8 + RM15 (next month commitment) =RM23 in my account.
(Please correct this statement if there is any mistake)

4. The prepaid family plan do NOT have FnF, but they can still enjoy Birthday Bonus and Reload Bonus if they perform extra reload by themselves (extra reload = reload other than the monthly commitment fee)
(Please correct this statement if there is any mistake)

is it randomly selected? i read through the T&C it stated it is based on first-come-first-served basis phone redemption @ DiGi OCS