How do we change email subject header for invoices from Invoice [Number.] from Company to Invoice [Number.] from Company Job Ref [Job Ref]

Hi finance-dws-dwsl Thanks for reaching out to us here on the Community. The default email subject header can be located/amended by selecting the cog/gear icon on the main page of your QuickBooks account > Account and settings > Sales > Messages > Select Invoice in the Sales form field > Enter your text in the Eamils subject line field > save.