How to put several PTZ's on a DVR? if you provide more information it would help.
DVR's are a storage medium like a VCR I know some DVR's can control PTZ's but for now leave it out till you answer all your other considerations.
Integrated Dome Camera systems things to consider.
(1) Transmission Type
There are a few options here COAX,Fiber,Microwave,RF and twisted pair are all possible solution. Remember that bi directional communication is needed you must be able to send and recieve data.
Each type has its pros and cons. If this system is in Malaysia consider fiber or Wireless (Lightning) at the very least surge protect your system
(2) configuration
If you have allready installed the cameras or are upgrading to PTZ's you can Daisy chain addressable cameras meaning one wire going from the controller to the first camera and then from that one to the next and so on.
If it is a new installation its best to run comminication directly to each camera especialy over a larger system. Grounding issues and a break in coms early in the chain means coms loss to several cameras instead of just one.
(3) equipment
There are several good quality manufacturers choose one of the bigger ones that can support you in Malaysia.
This is a start please take the time to explain what you are hoping to accomplish with this system and some site information and i can be mor specific.
Good Luck