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Thank you for your suggestion but I have just agreed with another helper that I like their solution of using SWITCH as a solution. Unfortunately the solution will not safe currently but I am sure that it must be something I am doing incorrectly.
At a later stage I do want to check a booking date and use a formula to assign the correct Qtr but that is jumping ahead of myself, unfortunately I really am not good enough to do any formula myself.
Thanks for you suggestion but it was not clear enough for me to fully understand the option.