Change file members when creating RPM updates - rpmbuild

Question

Our application has been packaged into a single rpm file for the past few years with the usual numbered updates. Now I'd like to separate out some of the files into a second RPM for product management purposes.
Is the correct way to just remove the files from the %files section of the old .spec file and add them to the new .spec file?
For example, we now have myApp.rpm built from:
/usr/local/myApp
+ bin/ {bunch of files here}
+ config/ {bunch of files here}
+ branding/
So the current spec file lists everything above in its %files directive.
To split branding into a separate rpm without messing up packaging? eg.
myApp.spec
Name: myApp
%install
{make directories, copy everything but branding}
%files
/%{_prefix}/myApp
/%{_prefix}/myApp/bin/*
/%{_prefix}/myApp/config/*
and
branding.spec
Name: myApp_branding
Requires: myApp
%install
{copy branding to rpm tree}
%files
/%{_prefix}/myApp/branding/*
When existing installations are upgraded, will the package membership of the branding files be now be the myApp_branding package?
Any downsides or risks to this approach?
Thanks

Answer 1

No, this is not recommended way.
Remember only one .spec file is enough for each project, you can use %package body item for additional rpm packages. for example add following code after meta information. i.e before %prep or %build items
%package branding
Summary: Branding for myApp
Requires: myApp
%description branding
branding files for myApp
After that, yes you can use multiple '%files' section for each package. like
%files
/%{_prefix}/myApp/bin/*
/%{_prefix}/myApp/config/*
%files branding
/%{_prefix}/myApp/branding/*
As you can see I have omitted /%{_prefix}/myApp line from main %files section. Actually when you pick a parent directory it automatically includes all its children, And when a sub package try to include child directory again, it will result in duplication error at build time. If you want to use /%{_prefix}/myApp then %exclude can help. see
%files
/%{_prefix}/myApp/*
%exclude /%{_prefix}/myApp/branding/*
%files branding
/%{_prefix}/myApp/branding/*