Create it by:
1. On the 2003 Server running DHCP, open the DHCP MMC.
2. Expand DHCP and select DHCP server name.
3. Right Click Server name
4. Select "Set Predefined Options"
5. Click Add.
6. Name: "Domain suffix search order" (without the quotation marks)
Data Type: String
Code: "135" (without the quotation marks)
Description: "List of domain suffixes in order" (without the quotation marks)
String: enter your search suffixes separated by comma with no spaces
- sample1.com,sample2.com,sample3.com
7. Click OK.
This worked for me. I cannot take credit for the instuctions, I found them on another site.