Hi Marion,
GridView only displays information from one data file at a time unless the dictionary was created to merge more than one file, as is the case with the 'IC Items (1,3) Master' dictionary. So when using this particular table, you won't be able to get the Vendor code from the 'Additional information' section because it is stored in a separate file.
GridView ships with a number of 'combined' tables, listed in the module selection screen as 'Composite Tables'. This is where you can select from pre-defined combinations of tables - one of which combines the IC Item file, the IC Additional Item (2) file and the IC category file. It is called "IC Item w Additional, Category". Another composite table includes all of this and the Item 'quantity by location' so you can get quantities by item at each separate location.
However, what this means is that you cannot 'convert' your view to a different table, but you would have to re-define it from the start. Don't delete the view you've already worked hard on - it can be used for copy/paste or export formulas you've already done.
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Regards,
Softrak Tech Support