I’ll assume you mean the software/library “4play” version 6.0.18 and want a concise helpful account (what it is, changes in 6.0.18, install/update, and quick troubleshooting). If you meant something else, say so.
The 4play 6.0 suite includes an Action Card Editor (often named Card_Editor.exe ) that allows you to customize the game experience, which is likely what you mean by "making a piece". How to "Make a Piece" (Edit/Create Action Cards)