We have supported apps that you can try, userm-dhashneem.

For us to give you the correct steps on how to manage your supplier transactions, do you have a specific app you're using and like what or AllStar mentioned how do your suppliers send you bills. It will be a great help for us to walk you through handling them within QuickBooks. 

You can check out this link that will route you to our Apps Center. Just enter a brief description of something like supplier/vendor documents. Feel free to also click this link for more articles about suppliers: Community Help Article.

Just let me know if you have other questions. Take care!