Edit .ctb files

Does anyone know of an easy way to edit the screening in ctb files besides doing each color individually? I've got to bump up the screening of multiple colors in multiple files, and it seems like an arduous task. I was hoping for something like a find/replace function.

Thanks

I don't know about Civil 3D but with AutoCAD 2008, I can go to the ctb file in Windows Explorer, right-click, "Open With..." > AutoCAD component... and the Plot Style Table Editor comes up. I can then edit all aspects of the ctb file, either in Table View or Form View. In Form View, I can hold down the CTRL key to select multiple colors under the Plot Styles option... and modify all at once.

But the Plot Style Table Editor can be accessed right from your Plot window, too. If you click the icon to the right of the Plot Style option, it will come up there, in Form View. Simply hold the CTRL key down and select those that you want to "bump up the screening" on.

what percentage screening are you after ?

Thanks Julie, I tried that in Table View (so I could see the screening) but it wouldn't select multiple. I guess I'll use Form View, just print the ctb first so I can see what screenings to change.

NBC- since the maintenance guy came to repair our plotter, all the plots with screening come out too light, so I have to bump them up, say from 25% to 40%... that's why I was hoping for find/replace function.

Julie- PERFECT answer, thank you!

Setting all lineweights to "By object" will basically mean that if I change the lineweight in the Layer Manager, that'll define the lineweight, right? (so "by object" kinda just means "by layer"?)