Ok, so with the links you posted you will want to modify the link that is going to the styles page to include the type id. So the link that looks like this:
Styles.php?ItemMakeID=1
Should look like this:
Styles.php?ItemMakeID=1&ItemTypeID=1
Then in the recordset on your styles page you will add in a filter for the type like this:
SELECT Items.*, ItemMake.*, ItemStyle.*, ItemType.*
FROM Items
INNER JOIN ItemMake ON Items.MakeID = ItemMake.ItemMakeID
INNER JOIN ItemStyle ON Items.StyleID = ItemStyle.ItemStyleID
INNER JOIN ItemType ON Items.TypeID = ItemType.ItemTypeID
WHERE ItemStyleID = colname AND ItemTypeID = colname2
Variable, Name: colname
Type: integer
Default value: -1
Runtime value: Variable, Name: colname
Type: integer
Default value: -1
Runtime value: $_GET['ItemMakeID']
Variable, Name: colname2
Type: integer
Default value: -1
Runtime value: $_GET['ItemTypeID']
I can see one issue with this recordset that you have though, it seems that you are filtering the ItemStyleID on the $_GET['ItemMakeID']. It seems that you should be filtering the ItemMakeID column rather than the style column on this value.
With the links and recordset updated like this you should Type to Make to Style keeping all the results filtered by the previous selection. Then when you are on the styles results page you will link to the details page for the individual item. This part should not change.