How to copy checklist from existing card or template?
To copy the existing checklist please choose the card that you’d like to add the checklist to and click Add new checklist in the right-side panel. You’ll see Copy checklist from a card or Card template option.
Upon clicking this option you’ll see the dropdown list of cards and templates that are available for copying checklists. Choose the necessary card or template, click Copy checklist from the card and the checklist will be copied.
To learn more about checklists please review this FAQ: