What does a 1099-NEC have to do with a K-1?
It sounds like you are running a small business that is a partnership of some kind, filing a 1065. That small business hires subcontractors who are independent contractors, not employees. The profit and loss of the partnership is reported to each partner on a K-1, that is included in the partner's personal tax return. A K-1 is generated from a partnership 1065, and is added to a personal 1040.
If you were a sole proprietor, your small business would be reported on a schedule C as part of your personal tax return, and that would include issuing any 1099-NECs to subcontractors who worked for the business. But this has nothing to do with a K-1.
If the partnership hired subcontractors, and did not issue 1099-NECs to them, that is a mistake that needs to be corrected. It might or might not change the 1065 and the K-1s. (For example, if the partnership reported the subcontractor expenses, but just didn't issue 1099s, that probably would not change the profit and loss on the K-1. But if the partnership failed to properly account for its expenses, fixing that would also change the K-1 statements for each partner.
If you are a sole proprietor, then your partnership expenses are reported on schedule C as part of your personal tax return and has nothing to do with a K-1, and your tax preparer is very confused, or you are.
Where did the K-1 come from? What kind of business? Who owns it? Who did the subcontractors work for?
