Hi,
I tested your case that you have explained, with the last release of WebRatio 7.2.6.
I added two slot on a slection field: one with "A" value and the other with "B" value, by generating the web application, the string that is shown in the selection field is "AB" as you want to obtain.
But if instead, you want to see the string "A & B", add another slot on the selection field with " & " value (with space before and after the character). To order the slots, move to the Properties View of the selector field and use the "Slot Order" property to order the visualization.
Best regards,
Ombretta Malinverno