If an internal job vacancy is offered and you wish to go for it then you need to ensure that you are fully prepared for an interview and to prove why you would be suitable for the position. Many companies advertise jobs internally prior to advertising to the public so if you are looking to move up the ladder within the business, then this could be a great opportunity.
It may be that your current boss doesn't want you to move departments and so they may even offer you additional money or additional responsibility to stay put.
Firstly you need to consider if you have all the qualifications and experience that they require. If not, it doesn't mean that you shouldn't apply but you may need to prove that you are capable of doing the job to a high standard and possibly even take a small pay drop whilst you are in the training phase.
Making sure you are on time, complete work to a high standard and offer to go the extra mile will impress any employer.
How to Stand Out for Internal Promotions
When going for an internal promotion, you have a distinct advantage: the company already knows you. Use this to your benefit by highlighting your achievements, your knowledge of the company culture, and your commitment to the organisation's goals.
Prepare just as thoroughly as you would for an external interview. Don't assume that because you're already employed there, you don't need to put in the effort. Dress professionally, bring examples of your work, and be ready to articulate your vision for the new role.