IIRC what you're thinking of is probably tossing the enemy into one of your own food market facilities and letting it produce hostile food monsters. the point values are low but its generally the only way to get higher point scores in free dungeons.
now if what you thinking of is comboing to increase a point value from a target i dont think its possible to combo a 100 point enemy to 1000 points IIRC even doing a full 8 unit combo and killing the target increases its points by either x2.5 or x3 at the most
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