Reimbursement between entities

Entity - you mean branch or subsidairy or indpendent office;

Your query is hazy and vague; If the companies are subsidaries theh you need to pass transfer orders with terms of payment for salries. 

It the companies are independent  of each  other with common propriertor/owner  and you want  to shift the emloyees from indian offcie to Dubai then you have to terminate the employment of employees in Indian Offcie and issue fresh appoitnment orders in the new compnay. 

It depends how you structrued the companies - best way is to  draft MOU between the two concerns and and in that you can incorporate an articlticle about recruitment, transfer, termination etc of employees.

The issue involves the prevalent law and procedures in two different countries and hence requires professional consultation.