To add a handling fee:
- Go to Shopify admin and then navigate to Settings > Shipping and Delivery
- Click Manage Rates in the shipping section
- Scroll down to a shipping rate, click the three dots then click Edit rate. Or add a click Add Rate.
- On the bottom of the edit popup, you will see a handling fee section. You can set it to a percentage or a flat amount
Another option, which might work in your case, is to simply set a flat rate “$2.00” shipping and just rename it to “Shipping and Handling”.
Check out the screenshots here if you’re still stuck.
Best of luck with your store!