how to chain ppt files on one master presentation?

[bilou]

hi all

I have a small problem, I have to realise a huge presentation under powepoint software , I cut this show in 4 parts ( 4 files .ppt) named A, B, C, D
I have a master show which present differents ideas and I use it to make hyperlink to files A , B, C or D
at the end of all files I insert a return link to the master file.
I think I lose a step in my mind because when I run the master file , I am obliged to click the hyperlink , I thought the run mode will execute automaticaly this operation ( click)
Can you help me , have you meet this problem and how you solved it ?
the show will be run on saturday 30 of april , it's a very short time to do this for me ...

thanks a lot for you help
bilou ( french man )