Automatically Hide Duplicate Items

We have a workbook that allow us to select a switchboard (In green box) in the "commissioning" sheet and it will display a list of items from "Fire Mode" sheet. What we would like to do now is when it displays the list of items on the "commissioning" sheet it automatically hides duplicates. Duplicates filter items to be picked from "Suffix" or "B column" & "#" or "C column". We need to group the "B & C" columns together and if it finds a duplicate it only shows 1 item hiding the other item. Is this possible? I have attached our workbook to make it easier to understand.

In the attached workbook you will see 2 items are the same in the commissiong sheet for switchboard number 5.

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CB