How do you tell your boss that you don't need this training?

In an ideal world, you should always have an open and honest relationship with your boss.

In the real world, we're human, and our bosses are human. And sometimes humans don't know what to do with a bit of information.

In today's day and age of sharing everything publicly, we can easily forget that there the TM in TMI stands for too much. There are things your boss doesn't need to know about you, so mums the word.

But, when it comes to training, even if it is not relevant to your job or you might not have any interest in the material, go for the training.  We are never to old to learn something new, and who knows, you might be surprised as to what you might learn, and more importantly, it does show willingness on your part.

The chances are, your boss already knows you do not need the training!

Google a training that you like. Send an email to ur boss that if u enroll for the Nominated training, then its effect on ur job performance will be like 10%. And instead you go for the training course XXXX company is offering, then it will have 40% effect on your job performance.

This way, your boss will have 2 choices. If its affordable, then he will enroll you for the suggested training. If its expensive, then they will ask to you to sit in office and do your work.

I'll talk with my seniors and get the idea about training and if its non relevant then I'll straight forward ask company to change my training relevant to my job field or-else just to skip my training. 

Today's markets, roles are dynamic and employees having expertise in multiple slots are nominated foremost.  The question is very comprehensive.  It depends upon the circumstances as follows:

1. The training session might not commensurate with current job but might be associated with other units or departments of your organization.  In these circumstances, it would be useful to attend the training session. 

2. The training session is not relevant to your job but might be of higher level.  This would be an opportunity to attend the session to grasp more vocational knowledge.   Most probably it happens when authorities are deputing some one on their place to attend the training sessions.  This could be useful to get higher level experience.  

Besides, if the job is still not relevant to your background or job description, it could be better to straight forward refuse to your authority in a sense to save the cost on getting the course adding no value for the resources of the entity. 

Thank you for your ideas, appreciate it.