Ignore Placeholder Macro
The Ignore Placeholder Macro allows you to retain placeholders when copying a template. To achieve that, you just have to insert the placeholder inside the body of the Ignore Placeholder Macro.
It is also possible to add other Confluence macros to the body of the Ignore Placeholder Macro. In that case, the macro parameters won't be replaced and references will point to the same location as before copying.
After copying the PTC Ignore Placeholder Macro persists.