Temporarily deviating from IFR

Danny Deger writes:

The call would be something like, "Request deviation 10 miles north of
course, altitude block of 2,000 to 3,000 feet and 3 360s to investegate a
possible car in distress." But, if the weather is VFR, "Cancel IFR" might
be the best call.

Can you reactivate an IFR flight plan after cancelling it and continue from
some point within the plan, or do you have to file a brand new one if you want
to return to IFR.

I take it there's no such thing as "suspend IFR."

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