Creating Employee Accounts for Existing Implementation Users

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Hello,

I have a bit of a basic question about implementation and employee user accounts. 

We have a few implementation users in the system whose accounts have already been setup with their email ID as username. For example, let's say their emails are A@example.com and B@example.com - their usernames would be A@example.com and B@example.com.

Now, we would be loading employees via HDL and both employees A and B would be included in the load. If we proceed with loading the employee records along with their email IDs, after running requisite processes, fresh accounts would be created for these users with a suffix say A-1@example.com, B-1@example.com and so on. We could turn off auto-generation of accounts but there are only a small set of employees who have implementation accounts (roughly 3-4).