What will happen to the existing data if I delete the reason code?

Hello everyone,

My company had too many Reason Codes before. So we want to reduce Reason Code. We want to convert several Reason codes into one.
But, it seems that there is no conversion feature. So I have no choice but to delete the old code.
In that case, if the existing Reason Code is deleted, what will happen to the Reason Code previously entered in the transaction?
Thanks in advance!

Epicor will prevent you from deleting records that have been used on part transactions only unused ones so you will be able to delete some but not all