At SFX Funded, there is no maximum limit on the number of evaluation accounts you can purchase, however the total funded capital for Rapid Challenge and the Ascend 2 Step Evaluation cannot exceed $400,000 and for Instantly Funded Accounts $80,000.
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You have to pass each challenge individually, you can't copy trades (EA or Manual) from a master account to an evaluation account or from one Evaluation/Challenge account to another Evaluation/Challenge to pass them simultaneously with the same trades & trade ideas.