RE: Acucobol excel
I am not sure I understand your question. Using ACUCOBOL-GT you are able to use our standard UI controls, labels, entry-fields, and ActiveX controls. Next, we also allow you to use Microsoft ActiveX or .Net assemblies, these may or may not have a UI. You use either AxDEFGen or NetDefGen utilities to generate a copybook from the control that defines the methods and properties of the control. Then you use the CREATE, MODIFY, and INQUIRE to use the control.
From COBOL you can CREATE (instansiate assemblies), MODIFY (similar to invoking a class or method) or INQUIRE (retrieving values). There are a number of examples C:\Program Files (x86)\Micro Focus\Acucbl9xx\AcuGT\sample\dotnet .. the amortcontrol or NETOBJECTS directories. And we have a chapter devoted to this in the documentation .. A Guide to Interoperating with ACUCOBOL-GT Chapter 5: Working With .NET Assemblies.