These are options in the DXF/DWG Translation Setup dialog box. The available options will vary depending on the language version of ARCHICAD you are using.
Custom Functions contains add-ons for both Open Extras and Save Extras operations. Several functions are loaded by default. Turn them on or off using the checkboxes.
Drag and drop to change the order in which they are executed.
If you add or delete any functions, press the Reload Functions button to refresh the list.
Store original Blocks
Optimizes the roundtrip of DWG files to and from ARCHICAD. Original blocks will be stored, so that unmodified DWG blocks, once reexported from ARCHICAD, will remain intact; no unnecessary new blocks will be created.
Leaders to Labels
This function works only if the Leader's content is in Text or Mtext, and if the Leader was created as a simple Leader. Multileaders and non-text content are not supported.