Follow the instructions in the FAQ below to delete a K-1.
https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-delete-a-k-1/00/26655
If you need to contact Customer support, use the link below during regular business hours.
https://ttlc.intuit.com/community/using-turbotax/help/what-is-the-turbotax-phone-number/00/25632
