Why Form 8453 checks Form 8949 to include in mailing without saying if Copy 1 or 2, and NO mention of 1099-B?

Dear TT Expert,

I have a 190 page 1099-B. During the step by step guidance, I elected to take the trouble to calculate and enter the totals to avoid the severe pain of entering the many line items from the 190 page 1099-B. TT then told me that I must mail the 1099-B with Form 8453.

After completing my return, the Filing Instructions tells me to mail to IRS Form 8453 and all forms indicating in Form 8453.

Form 8453 has a check mark next to Form 8949. I have 2 copies of Form 8949. Must I mail both copies or only Copy 2 that seems to relate to the 190 page 1099-B?

More importantly, is it sufficient to just mail Form 8453 with Copy 1 or Copy 2 or both Copies of Form 8949, without the 1099-B?

I know nothing about taxes or the inner workings of TT. Please kindly give details in plain English in your help and guidance.

Thank you so much!