Hi Samantha,
Thank you for reaching out to us.
You can definitely use any of the accounts from your COA in QuickBooks Online by importing the ones you want to use in KeyPay via:
Employees > Payroll Settings > Under Business Details select Chart of Account > click the button Import Accounts on the top right. You then select the accounts to be imported by putting a tick to it then Save.
If you require further assistance, please do not hesitate to get in touch with us.