Using out the box Anaplan funtionality you should be able to basically get the result you want by creating one role per user. Downside is obviously that you could end up with a huge number of role and it will be relatively laborious to maintain. Something to bare in mind here is that one of the upcoming releases we will get the ability to work with the userlist as any other list, and be able to create much more flexible security solutions. This should meet your needs much better than the above suggestion if you can wait.
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