You can definitely do that by simply adding your business or personal account (depending on which one is currently missing) to one drive app.
Click on one drive cloud icon in the taskbar the click on help and settings icon on the top right.
then click on settings again and then in the popup window click on account tab.
Check which account is logged in then click on add account.
Add the missing account in the location.
Confirm your choice.
This will add two one drive shortcuts in your file manager one for personal and one for business both of them will be independent and both will have your documents separately. Though note that your local files (in c and other drives) will be available for both accounts.