Create WHM account from already created Linux account

If this is a question that's already been answered, please point me to it. I've tried searching but haven't found anything relevant, but that could be due to the keywords I've tried searching. I am in the process of setting up a new server which has WHM. I am pretty new to WHM, but I'm more familiar with Linux than WHM. I manually created a few dozen accounts inside of Linux, but when I try to create an account in WHM using the Linux account (`whmapi1 createacct username=linuxaccount domain=example.com`), WHM throws the error `This system already has an account named`. Is it possible to somehow create a WHM account that uses a Linux account I've already created? Like some kind of command that I can use on the command-line that will create the WHM from the Linux account? I am hoping to use `whmapi1` if possible, but I'm not sure which call to use. Thank you. EDIT: I ended up pulling the account list from `/etc/passwd` using `cat`, copied and pasted requisite contents into VS Code, used some regex with find and replace inside VS code to remove the extraneous details, and made a couple shell scripts to delete both users and directories. I then took the same list and added the `whmapi1 createacct` command using some more find and replace regex magic. Thanks anyway!