Dealer Portal Vs DBM

Hi Gurus,

I would like to understand few things here.

There is this Dealer Portal which uses the services of VMS, Spare Parts Functions and WMS.

Now as I understand there is add-on called DBM. What are the differences we have incase DBM is activated.

Secondly, if we activate DBM, will it be like previous VMS, WMS settings are irrelevant or those are still useful.

Thanks for your replies and points will surely be rewarded.

Regards,

Rahul