To create projects in your slurmdbd for a given cluster you can do something like the following with the sbank-project command:
$ sbank project create -c mycluster -a myaccount
If you make a mess of things you can delete it by doing:
$ sbank project delete -c mycluster -a myaccount
Once you have created some accounts you may want to associate users with the account:
$ sbank project useradd -c mycluster -a myaccount -u someuser
This will create a user and associate 'someuser' with 'myaccount'. It also sets 'myaccount' as the DefaultAccount for the user.
If instead you do not wish to update the DefaultAccount, then add this flag:
$ sbank project useradd -c mycluster -a myaccount -u someuser -s
you can also remove users from accounts.
$ sbank project userdel -c mycluster -a myaccount -u someuser