I can share how I figured this out in Quickbooks online. Not sure what you are using. Took me hours!

In August I was able to use a Transaction report list that I could export and show all the details including split payments to contractors. That option is no longer available. 

This morning I was able to use the Check Detail Report under Reports, expenses and vendors. I customized it for year to date, grouped by Name only (to show the vendor/contractor names in alpha), to show Date, Number, Name, Memo/Description, and Amount. This gave me what I needed FINALLY. I was able to save the report for future access. Hope this is helpful.