Updating current formula from counting days to counting business days

Hello! I have been tasked with creating a formula that looks at the request type (drop down) and based on that, adds a certain number of business days to the request submitted date to give a completion date. There's 6 options, I was able to make the formula just with regular date counting, but now I need help in adding in the 'working days' formula into this, so the date that is calculated is skipping weekend days. For example, selecting option 1 would add 3 business days to the created date, option 2 would add 5 business days, etc.

=IF(CONTAINS("1-", [Order Type]@row), [Created Date]@row + 3, IF(CONTAINS("2-", [Order Type]@row), [Created Date]@row + 5, IF(CONTAINS("3-", [Order Type]@row), [Created Date]@row + 14, IF(CONTAINS("4-", [Order Type]@row), [Created Date]@row + 21, IF(CONTAINS("5-", [Order Type]@row), [Created Date]@row + 5, IF(CONTAINS("6-", [Order Type]@row), [Created Date]@row + 10))))))

It took me a while to get here, and it is working perfectly as a column formula, so don't want to completely start over/ reformat and risk messing it up again. just hoping to add something in here to count working days only

Thanks!