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Self Join Table Form Development

Self Join Table Form Development
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I have a table with a field that relies on another field in the same table. Very much like the Employee/Boss table design that is used for self join examples. I have developed the tableand query but do not know how to make the form that would support the table design.

The field in the table are:

strID (Primary Key)

I think it will require a two form approach, one to create the employee and one to assign the boss. But I want the boss to be a combo box with only employees that have been created.
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I am trying to join two tables but keep getting attached error.

The tables which l cannot join are company and fleet data and management vehicles subform table.

I don't mind how the two tables are joined as long as l can create records without any problems and then create a query to link which combines the two.