Almost every government job announcement notice specifies that employees of the government should apply through the proper channel / No Objection Certificate (NOC).
Government personnel should apply through the proper channels (i.e., their parent department), with an application written to their departmental heads and forwarded to the department to which you are applying.
If your application is forwarded, it means you applied correctly, and your parent department will not hesitate to relieve you if you are selected in the new department.
Your service will be protected, which means that if you have worked for your parent department for two years, you will be treated as a senior employee in comparison to other newly hired employees. Your pay will be protected, which means you will be entitled to all previous increments.
If you are not interested in the new position, you can leave your parent department on lien* for one year or as prescribed. This means that if you are not interested in the new work, you can return to your parent department within one year or as recommended. A person on probation period may apply through the proper channel but he is not eligible for a lien.
If you got the jobs without obtaining a NOC or applying through the correct channels, you will be required to leave your current position before being considered for a position in another department.
If a person joins another government department without quitting their existing one or resigns after a few days and receives pay from both, this is considered a crime/misconduct and will result in a punishment.
*Lien: Means the title of a Government servant to hold a permanent post in a substantive capacity. Lien can be awarded only for regular government jobs.