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In general it is accomplished by changing product status to 0x61 on the details tab of s3oc, and ticking the places where it should appear in the catalog on the various flags tabs. But there are various reasons why it's good to use an existing buyable object if you can - things like not sinking half way into the table when you place it, etc.
"You can do refraction by raymarching through the depth buffer" (c. Reddeyfish 2017)