I am trying to achieve the following.
I have a contacts list which has a lookup field called companies which is linked to a companies list.
When a user wants to add a new contact and selects company but the company is not in the list - add a new value without exiting the form.
I am sure this is relatively simply but just can't seem to find an answer
Hello @Lensteruk,
To enable adding new records, please select the lookup field in Plumsail Forms editor and at the right panel go to Settings >> 'Add New' and choose True.
The user will see the button as on the screenshot when will start typing the text in the lookup field.
Ahhhhhh the fog has cleared.. that's awesome.. knew it would be simple... thanks so much for this... 
Is there a way from the control events to distinguish between Add Item and selecting from the drop down?