If you setup a Supply Forecast, my understanding is that Master Planning will not attempt to create supply orders for your 600 per week. It doesn't directly offset the demand forecast, but it means that Master Planning will not plan to supply that which you are already planning to manufacture. Alternatively, you could create Production / Planned production orders for the quantity that you plan to manufacture on the dates that you plan to manufacture them, and AX will chuck that into the mix when Master Scheduling runs.
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