datagroup place object - update

Hi,

I've made some "datagroup - objects"  ( beams and columns) but the are placed as an object ( user defined  catalog types)
the beams and columns are defined in a cel-library,

now I have updated the cells: (added some more details)

how to update the placed user defined catalog items to show the updated cell,

If I place a new user defined  type, the new cell is used, but I do not want to delete and replace all the placed datagroup objects already in the file,
I want to update all the existing objects - to the new cell definitions.

Rik

OBD 10.06.03.04