Modules & VBA :: How To Add Check Box Values In To Filter String

I have got like subform which I think is the tech term I use it to filter dates on field "date raised" and open's a report depend on date's entered in txtstartdate and txtenddate it works perfectly but I need to add some check boxes to check other field's are true/false ...

Code:
Private Sub cmdPreview_Click()
Dim strReport As String
Dim strDateField As String
Dim strWhere As String
Dim lngView As Long

[Code] ....

I need to add code to the text in red well I'm guessing

here goes with what I would like to add
job cancelled1 check box name field name= job cancelled
job on hold1 check box name field name = job on hold
void property1 check box name field name = void property

E.g. if I put date range in my date boxes and tick job cancelled show all record in that date range cancelled same with job on hold and void property

here some code I did but wont work as it not in the same strwhere above

Code:
if me[job cancelled1] = true then
strwhere = [job cancelled] = 1 'field name
else
strwhere [job cancelled] is null
end if

Some how need to add the strwhere to the code above ...