Sage 50 Accounts Professional - Customer Custom Fields

SOLVED

Hi

I am wanting to use Customer Record - Custom Field Analysis 1 to record customers who want to Opt In to marketing so that we can comply to the new GDPR regulations on data handling. I know that I can change the name of this field in the configuration settings but is there away of forcing the data what data is recorded in this field possibly by dropdown menu selection. Eg, I only want the allowed entry to be 'Y', 'N' or 'Opt In', 'Opt Out' so that this information is recorded in the same way for each customer. Or is this field purely free-text with no way of changing this.

Many thanks