By default, 1099 vendors created in Bill.com sync to Sage Intacct as:

• form1099type=MISC
• form1099box=7

If these default values don't match your accounting needs, always create your 1099 vendors in Sage Intacct, so you can select the correct form type and/or box. 

For all 1099 vendors, the bill line items associated with an account marked as 1099 will be synced to Sage Intacct accordingly (the form 1099 is set to true in Sage Intacct for the line item). Therefore, in Sage Intacct, you can generate reports for your 1099 vendors.