STEP 1:
Find the Utilities tab at the top of the screen and select "Xmit Code Control"
Find the prefix you need in the given list (in this example, we are using H10) and click on it. Only the blocks of accounts assigned to you will be visible.
Please be advised, Xmit Code Control DOES NOT work for suffixes
On the right, a list of available account numbers for the selected prefix and your assigned block of accounts will pop up. Use the next available account number in the list as your account number entry in My.AG and create your account as normal. Once the account is created, the Xmit Code Control list will update, removing the account number you have used.
If you use My.AG to create accounts via copying a template, DO NOT proceed to the next step.
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STEP 2:
If you do not have an account template to copy from, you can select which account number to use, and click the "+" button
Once this is done, a new window will pop up where the account information can be added. When you are finished inputting the information, click the save button in the top left corner. The account has now been created. Be sure to add the device type, timer test settings, and anything else if you are not copying from a template that already has these in place.