Adding to color selections in the gel files

So a cinematographer has given me a list of colors by different manufacturers that he wants to have at our fingertips. Trouble is most of them are not listed in the board. Rosco e color for instance. He's looking in the 650,651, 652. These colors don't exist in the desk. Is there a lookup table? Or a process to have these colors made and allowed into desk?
T. I. A.

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