Allow me to share some information about turning an estimate into multiple purchase orders in QuickBooks Online.
At this time, turning an estimate into multiple purchase orders from different vendors is not available in QuickBooks Online. As a team with a massive road-map, we have to pick new features based on the value they’ll add to the most users possible. You may want to send feedback to our product developers to let them know that this is something you'd like to do in QuickBooks Online.
We share recent happenings and future developments on our blog. Through this, you're able to get the latest news about QuickBooks and what our Product Care Team is working on. You can check out this link: https://quickbooks.intuit.com/blog/.