This sounds vaguely like a "homework" assignment but....
1 - how i can make startup disk Win2000 (or startup Win2000 CD-Rom) ?
Format a floppy under Win2000 (not 9x) and copy
these files from the root of your hard drive (C:\)
ntldr, ntdetect.com, boot.ini
and if it's there: ntbootdd.sys
CD-ROM? What do you want it to do? The Win2000 CDROMs
are already bootable for installation and...see #3
2 - and how i can run Command Prompt From Startup CD-Rom of Win 2000 ?
During installation once the GUI starts, you can press F10
to get a command prompt or see #3
3 - how i can change Active HDD Partition From Startup CD-ROM ?
Boot the CD-ROM, at the first prompt choose "R" (repair), then
follow the prompts to the "Recovery Console" (logon as the MACHINE
admin) and you are at a Command Prompt (of sorts); it's not DOS or
Win2000 CMD but it has a bunch of cmd prompt utilies and the same
look and feel.
AND among the choice there are several commands for managing
hard drive partitions (partition, format, fix boot sectors etc), so type:
Help