Statusmap hosts



I have more then 250 hosts on a distributed nagios, then I have one central nagios, that recieves the results from the distributed nagios.

I have two questions:
1.How can I put the distributed nagios as a “child” (parenting) in my central nagios under some host?

2.The statusmap on the central nagios shows icon of every single one host from the distributed nagios. I wanna know if I can see only one icon in wich there are these 250 hosts and if one host is down etc. I’ll get notified on the one icon.

I hope I made myself clearly, if not do not hesitate to ask for futher explenation…

thanx, matko