'yum group' configuration - perhaps

Hi

This may be a yum question or it may be an rpm question but i'll got for 
yum for now.

Basically i have packages that are provided by a third party that go to 
make up the 'application' - There are in fact 4 different types of 
applications that these rpms can make up depending on which ones are 
installed. Alas this third party cant build rpm's correctly and they are 
not dependent on each other nor are they built in such a way tha if you 
install them all at once they sort themselves out, they need to be 
installed in a 'sequence'

So....

Can i somehow tell yum in some way that in order to install application 
X install rpms a, b and c in the order b, a and then c ?

If not then i think the only way around this so i can install the app 
with a yum install X is to create a single rpm that has the other 
packages as dependencies and fix it that way but i thought there must be 
a better way?

I hope that makes sense, and alas getting the vendor to fix it their end 
it futile.

thanks