Upvote:2
Can I apply without these?
Yes, you can apply without submitting tax returns and employment confirmations. The only documents required by law are...
All the other supporting documents are optional. You will need to use your judgement and best practices to determine which supporting documents to provide with your application.
I wanted to note however, that in the comments you wrote...
they just want to me to visit their company and practice their procedures in order to follow their system, when i'm back to India after my visit i have to work as their agent.
This type of training does not appear to be an approved activity and so it's likely that you should be applying for a different kind of visa. You would be advised to carefully check that what you plan to do is an approved activity.