If you wanted to make sure the two fields are exactly in sync (i.e. your "state" field matches the "invoice state" field) then simply open the following file:
components/com_comprofiler/plugin/user/plug_cbpaidsubscriptions/xml/edit.front.invoice.xml
Copy the list of states from this file, then amend your "state" field to be a "select" field and ensure that you add all the states found in the xml file as options in your state field.
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