Copying and pasting objects in DreamPath is done by right clicking on the object and choosing "Duplicate" or "Duplicate to other pages". Alternatively it can be done by choosing the object and pressing Ctrl+D for Duplicating and Ctrl+S for duplicating to other pages.

Duplicating to other pages
Duplicating an object to other pages will open a dialog where it is required to choose the pages that the object will be copied to. When the result is satisfactory pressing "Duplicate" will duplicate the object.