Odin variant - sdelat' Boolean difference. Delaesh' dva ob'ekta, odin - tot iz kotorogo vyrezaesh', vtoroi - po forme kotorogo vyrezaesh'. Vybiraesh' ih, idesh', po-moemu, v Edit Polygons>Booleand>Difference. Eshe (tozhe dlya polygonov) - s pomosh'u Split Polygon tool i Create Polygon tool otmechaesh' oblat', kotoruiu hochesh' vyrezat', potom vybiraesh' ee i nazhhimaesh' Delete.
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