@DaveAtSafe
I do direct translation DGN --> DGN [MicroStation V8i (SelectSeries 3) Version 08.11.09.614)]. The SOURCE file contains only three lines of custom styles: one is dashed line and two others contain point symbols. A SEEED file ia a copy of the SOURCE file. A translation is made by FME Workbench [FME(R) 2016.1.2.1 (20160929 - Build 16674 - WIN32)]. It is successful, with a warning 'DESIGN WRITER: Cell with the name 'Linestyle Definition Cell' could not be found in the cell library provided. Feature is being skipped....'. In a RESULT file, the dashed line is OK, whereas lines with point symbols are represented by straight lines. How could I translate correctly custom line styles with point symbols?