Ahh, you're running FTD software and not ASA code with an SFR module. With the FTD software, you don't define security-levels as there is just a single global access-list called an access-control policy that is used to control traffic. Inside that policy you're select which interface, network or zone you want for source and for the destination to match traffic on. Also to note is that the CLI is very limited with FTD as it's designed to be managed by an FMC.
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