I want to create a new section called "Purchase Orders" which will be same as the existing "Orders" section, how can that be achieved?
There is the post describing the whole process. The guide on how to do it can be found here https://community.bpmonline.com/articles/register-custom-section-existing-object
In the account dropdown in the Orders section list page, we have a blank value.
Where does this come from and how do we fix it?
http://prntscr.com/mhsa9z (screenshot for extra clarity)
This field should have "Add assignee" text. try to inspect it using browser development tools and check if there are any errors in the console. If everything looks fine send email to email@example.com