The owner of a business conducts a transaction over $10,000. but the account is not styled as a DBA. The business information is listed in part 1 section A. Should the owners information be listed in part 1 section B as individual conducting transaction and on the second page part 1 section A on whose behalf transaction is conducted?
Since the business and the owner will benefit from the funds.

If the business is not a sole proprietorship, it has its own existence. The fact that the owner of the business may profit (or lose) from its operation is not material to how you fill out the CTR. The owner is listed as the transactor (in 1B) but NOT as a person benefiting from the transaction (1A). You complete section 1A about the business only, and section 1B about the individual.

Only if the owner is the sole proprietor would you list him/her in section 1A (and in that case, you would not list him/her in section 1B).

I have found through the years that it is often the filing of a CTR that uncovers the fact that an account has been established incorrectly on the "system" (sometimes for years). If any questions exists as to the validity of the information on the system, additional research should be performed to insure the CTR is properly completed (and to make sure that the account relationship is properly documented and loaded to your system).