linking field from main form to sub form

[Stoic]

Hi,
I have an entry form with a field(combo box) called cboGetCode. I also have a sub form (continuous form) with number of fields, also an entry form. Now, I have added a code behind the cboGetCode AfterUpdate event to populate the result to relevant fields in the main form.

Me.lngSCode = DLookup("[lngSchoolCode]", "[qrReadingFirstSchools]", "[lngSchoolCode]='" & Me.cboGetCode & "'")

This is working very well.
Now, what I would like to do is get code as shown in the cboGetCode field to my sub form lngSCode field.

Any help?