There is no Individual/Sole Proprietor option in the entity dropdown list in K-1 worksheet

@brilliantusa  I am confused as to your entity ownership.  What I get is 

(a) You have a partnership / multi-member LLC

(b) Some of the members themselves also have sole proprietor business.

(c) Are you saying g that these sole proprietorships  ( dis-regarded entities )  entities are members  OR the sole-proprietor  owners  ( persons ) are members ?

(d) Partnerships themselves  ( at entity level) obviously can be natural person or   fictitious  person.

 (e) my sense of  your entity is a partnership of persons with SSN but obviously there should be no issue having  an EIN if the member  does business  as an entity -- if TubroTax gives you trouble you can always enter the EIN  in the SSN format.  For tax purposes though a single member LLC is disregarded entity and files schedule-C with owner SSN

Does this make sense ?

maybe not quite understanding. are you say that their business are the members of the LLC not them individually.

if so based on what you provided their businesses (sole proprietorships) are disregarded and the k-1s go to the owners which means you need the owners SSN

if there business were S-corps or partnerships then the k-1's would be issued in the name of the S-corp or partnership and the EIN would be used. 

the issue is at their end. filing a schedule C doesn't allow for reporting k-1s from pass through entities (like your partnership). rather they would report as if the k-1 was received directly by them.