In this connection you could use as long name for your (rather unlikely) example:
Moodle Demo (CF101)
and as the short name:
CF101
The only problem could be if there is some other place where the long name is used that this would be unsuitable.
PS I still have no clue WHY you want to do this, which makes is sort of like working in the dark.
Teaching with Moodle
Course Short Name in Combo List
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