You can create email templates which will be readily available for insertion whenever you are sending an email from Arka Inventory. To create an email template:

Go To Setup > Email > Classic Email templates > New Template >Select 'Text' > Click 'Next" > Tick 'Available for Use' tick box > Give any name our your choice, > specify subject and write the content in the 'Body' section

To use the template in the email, while sending the email, click on Insert, Create,Update template icon.  Icon image as shown below: