BAHRAIN visit visa

I want to apply for Bahrain visit visa e visa for my cousins with her children's
How to apply for evaisa
And how many days it will take

Evisa you can apply on evisa.gov.bh.  It is an un-sponsored visa so basically, even if you apply; it is as if the applicant has applied themselves.  Be aware that a lot of evisa applications for women from Pakistan end up getting rejected on un-sponsored basis. 

Your best bet is to apply for a sponsored visa through your company.  This cannot be done electronically and you have to apply on paper forms, directly with NPRA.

Either of the methods can take from 1 day to 1 week.

Thanks x tang
What is the procedure for apply visit visa on behal of my company
May I know the procedure and require documents and how many days it will take to issue visa

Time I have already mentioned above.

Documents needed are filled out visa form, copies of passport of visitors and their relative i.e. you, letter of sponsorship addressed to immigration from company on letterhead with stamp etc.

Get a good PRO to help you with that.