Can I use my Preset Chart of Accounts from another Business I have set up in Manager
You would need to back up the existing business, restore the backup, change the name and delete all the transactions.
See this Guide: https://www.manager.io/guides/16464. To minimize delays withs the program not deleting transactions referenced by other transactions, I suggest beginning with the Receipts & Payments tab.
Honestly, though, it may be faster to create a new chart of accounts than delete a lot of transactions, depending on how long the source business has been in operation and how complex your chart of accounts is