No direct transfer exists. Creative and Survival are separate game modes with isolated inventories/world data. But workarounds exist:
/gamemode creative → build → /gamemode survival → keep inventory (if keepInventory gamerule true)./gamemode creative, build, /gamemode survival, /give @p <items> from memory./give @p structure_block → place → Save mode → name → detect corners → Save./give @p structure_block → Load mode → same name → Load → rotates/mirrors..nbt files from generated/minecraft/structures/).//copy → //schem save name.//schem load name → //paste.On servers: Ask admins. Creative→Survival transfer often banned (economy ruin). Single-player: your world, your rules.