Steffo
Since I posted that method a few months ago on Doom9 forum, someone replied with:
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You have four TitleSets with
VTS_01_1.VOB, VTS_01_0.IFO, VTS_01_0.BUP
VTS_02_1.VOB, VTS_02_0.IFO, VTS_02_0.BUP
VTS_03_1.VOB, VTS_03_0.IFO, VTS_03_0.BUP
VTS_04_1.VOB, VTS_04_0.IFO, VTS_04_0.BUP

Delete the existing VIDEO_TS.IFO // VIDEO_TS.BUP

Run DVDToolBox.
Source = Path to the TitleSet folder.
Click Create Video Manager ( VIDEO_TS.IFO ).
Close DVDToolBox.

Run IfoEdit0.95
Open VTS_01_0.IFO > VTS_PGCITI > VTS_PGC_1 and scroll down to There is no PGC Comand Table
Right click and choose Add Postcommand.
Right click on 1.Post Command > Edit Command
Command: (CallSS_VMGM) Call VideoManager PGC
PGC Nr: 2 (go VTS_02_1.VOB)
Resume Cell: 1
Save VTS_01_0.IFO

Open VTS_02_0.IFO > VTS_PGCITI > VTS_PGC_1 and scroll down to There is no PGC Comand Table
Right click and choose Add Postcommand
Right click on 1.Post Command > Edit Command
Command: (CallSS_VMGM) Call VideoManager PGC
PGC Nr: 3 (go VTS_03_1.VOB)
Resume Cell: 1
Save VTS_02_0.IFO
...

And so on.
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I've been using it ever since... works great.

Chas