Want to have a specific Salesperson automatically assigned to all of your newly created accounts? No problem! You will need to set up an Automation first.
Navigate to: Partner Center > Automations > My Automations > Create automation > select Blank Template :
From here, a sidebar on the right will pop up prompting you to add a trigger. Under "Start the automation when", select An account is created and hit Save (adding conditions if need be, but not necessary):
Now select the "+" button located underneath the trigger you just created. Scroll down to Sales and select Assign a salesperson:
Select the desired salesperson of choice and click Save. Once this is done, toggle the automation on and you're all set!