How to open a new record inside a console in SubTab by inline visual force page

Include JS in VF page

<apex:includeScript value="/support/console/26.0/integration.js"/>

Write below Java Script code in VF page

<script>

 var preRecordId;
        
        function testOpenSubtab(id, name) 
        {
            preRecordId= id;
            //First find the ID of the primary tab to put the new subtab in

            alert('URL----->'+'{!$CurrentPage.URL}');

             if (sforce.console.isInConsole())
                sforce.console.getEnclosingPrimaryTabId(openSubtab);
             else
              window.top.location.href = '/' + id;
        }
        
        var openSubtab = function openSubtab(result) 
        {
            //Now that we have the primary tab ID, we can open a new subtab in it
            var primaryTabId = result.id;
            
            sforce.console.openSubtab(primaryTabId , '/'+preRecordId , true, 
                preRecordId , null , openSuccess, 'salesforceSubtab');
        };
        
        var openSuccess = function openSuccess(result) 
        {
            //Report whether we succeeded in opening the subtab
            /*
                if (result.success == true) 
                {
                    alert('subtab successfully opened');
                } 
                else 
                {
                    alert('subtab cannot be opened');
                }
            */
        };



</script>

Then use below link to open new record .

 <a href="#" onclick="testOpenSubtab('{!Obj.id}', '{!Obj.id}');return false">{!Obj.customKey}</a>