Extend Multi Visit Visa Valid 180 Days

Dear SIr,

i bring my family for visit visa validity 180 days. now when i check in absher for the validity of my family visa it shows only 30 days. then i check with my office they inform me it is multi visa and they must be go outside from saudi to renew this one. i have a few question regarding this matter.
1.  is it is possible to extend the visa without going outside.
2. if it is possible how many days they can stay here.
3. if it is not possible to extend visa without going out then what is the next possibility.


please help me regarding this issue.

your immediate response in this matter will be highly appreciable.

Thanks & Best Regards
Shameem

Did you able to renew?
Is there any possibility to renew without exit country?