My suggestion is that you do, but minimal ones, and have once "master" include file which all import.
Otherwise if you make a change to one file you have to pay attention making the change in all files. el On 2019-04-13 16:34 , Daniel wrote: > On 13/04/2019 15:01, Dr Eberhard Lisse wrote: >> On 2019-04-12 16:43 , Daniel wrote: >>> A similar way, but without the need of extra master documents, to >>> achieve this is to have all parts in child documents, including one with >>> the Title and TOC, etc. Then you can deactivate child documents via the >>> Document > Settings of the master as seems fitting. >>> >>> Daniel >>> > If make the changes in each LyX "master" file you run in to the >>> problem >> of having to keep track of the changes. >> >> Therefor it's better having "master" LyX files and an include.tex for >> all common changes. >> >> el >> > > I don't understand what you mean. My suggestion means you don't need to > more than one LyX master file. > > Daniel > >