Different pwm pin for laser and spindle about core HOT 6 CLOSED

Yes - but you have to add driver support or a driver specific plugin for it. With the Huanyang spindle plugin it is already in place.

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my expectation is , if $32 is activated then laser pwm pin will be triggered (via M3 Sxxx and M5) otherwise spindle pwm pin will be triggered

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Yes - that is what is the code linked above does. It checks the $32 setting for laser mode and switches the spindle accordingly.

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I want to use different pwm pins, BESC spindle and pwm laser with fysetc e4 board, does this board support the plugging you mentioned?

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No, a board specific plugin or driver code has to be written for that.

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In later versions of the core it is possible for plugin/board support code to register additional spindles. These spindles can then be selected with $32. The spindle plugin also add M104 for selecting which spindle to use without changing the $32 setting.

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