I am central gov.employee my child complete his 10 and 12 in haryana,but we are from Maharashtra how can I got 85 % quotas

Dear aspirant,
According to new rules applicable from 2017 you do not need a domicile certificate as you'd be in a special type of candidate category.
Since you were from Maharashtra if you have a domicile certificate then that's sufficient for your kid. As he/she/they would be a Type-B candidate.
Else if you have a birth certificate in Maharashtra then quickly make your domicile that will be sufficient to put your kid in Type-B
For future use I'll explain Type-C is where parents are employmee of central and have been residing in Maharashtra for less then 10 years as they were posted in Maharashtra at the time of application of the student.
Type D- same but for state gov employee
Type C - disputed land resident.
Since you were not posted in Maharashtra you can't at the time your child would apply in Maharashtra you must produce your own domicile or use your birth certificate to create your domicile for Type -B

Dear Deepak sir, you can get the benefit of quotas with the help of domicile of that particular state like if you have domicile of Madhya Pradesh then you can avail quotas benefit of Madhya Pradesh state otherwise you can't get the benefit of quotas. That's the only necessary document required to avail quotas.

All the best for your Kid

Dear aspirant,
If you have a domicile certificate or if you're born in Maharashtra then you can contest for the 85% seat.
How you will get a domicile is completely upto you.