There's plenty of information regarding WS in the technical reference documentation.
You need to use : createRequest.
I'm assuming you are a programmer and expect you to understand that i'm not going to teach you how to code.
Here's a powershell code snippet :
$svc = New-WebServiceProxy -Uri http://servicedeskURL:8080/axis/services/USD_R11_WebService?wsdl
#WS username.
$wsUsername = "username"
#WS password
$wsPassword="password"
#Login to get SID
$sid = $svc.login($wsUsername,$wsPassword)
#get customer handle
$customerHandle = $svc.getHandleForuserID($sid,"customerUserName")
#get creator handle
$creatorHandle = $svc.getHandleForuserID($sid,"creatorUserName")
#Get variables ready
$prop = ""
$attr = "persistent_id"
$requestHandle = ""
$requestNumber = ""
$summary="Test incident"
$description="Test incident"
#get group handle
[xml]$groupHandleReturn = $svc.doSelect($sid,"grp","last_name='GROUP_NAME'",1,"persistent_id")
$groupHandle=$groupHandleReturn.UDSObjectList.UDSObject.Handle
#get category handle
[xml]$categoryHandleReturn = $svc.doSelect($sid,"pcat","sym='category name'",1,"persistent_id")
$categoryHandle=$categoryHandleReturn.UDSObjectList.UDSObject.Handle
#Attribute to set (key,value) array
$attrVal = "customer", $customerHandle, "type","I","summary",$summary,"description",$description,"group",$groupHandle,"category",$categoryHandle
#Create incident
[xml]$newRequestHandle = $svc.createRequest($sid,$creatorHandle,$attrVal,$prop,"","id",[ref]$requestHandle, [ref]$requestNumber)
$requestHandle
$requestNumber
You need to understand SDM objects and attributes in order to use WS.
Regards,