Investors & landlords

So what happens if you go to a third party to combine two brokers wash sales trades onto one 8949 (long term and short term listed) and need to report it.  Looks like you need to put both names in the same field on the summary.  Do you mail in and include the 8949 and the 1099b (two brokers) you didn't use.  Is their a proper way for this situation.?

 

 

Thanks