You can use the summary method as you did by combining the sales. TurboTax is letting you know the Form 8949, a copy of Form 1099-B and Form 8453 must be mailed to the IRS. This is normal and routine when transactions are summarized and will not be a trigger for a CP2000 notice.
Mail your statements along with Form 8453 to the following address within three days after the IRS accepts your tax return:
Internal Revenue Service
Attn: Shipping and Receiving, 0254
Receipt and Control Branch
Austin, TX 73344-0254
If you need a blank Form 8453, you can download this pdf, enter your address information and check the box for Form 8949 (this form is really just a cover sheet).
@arorapankaj
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