Can I join other company after a month without re-applying H1B transfer?

Hi All,
I am having below question which urgent and important for me:

If two company applying H1B transfer simultaneously. Suppose companies A and B applying for same start date.
If I join A on the date and ask B to wait with some reason. And B is ready to wait for a month.
So, can I join B after a month without applying again H1B transfer for/from company B?

Any help will be appreciated and thanks in advance.

No… U cant… Transfer/Cap-Exemption must be filed