Trying to use Export/Import to duplicate records with subform records (typical Sales Order).  When I choose Select All for the Export Spec, there seems to be two groups of elements.  I can find nothing in the manuals explaining the "S" and "Mode" columns.

The first 386 elements are sequential with yellow "right arrow"s with a mode of "O".  Then I get another 39 elements with a black "right arrow" and the mode is "Open"
For the lower mode values, I can change to Open/Fixed/Max, and no choices possible in the upper section.

Can someone please explain the purpose and options and how to use these values?  What is the difference between the yellow and black lines?

Is there a section in any of the documentation that explains this?

Thanks for listening.

Thanks again, Ray. 

It's all so obvious when you know the answer to the question!