SAP UWL custom columns

In existing UWL, we have some tasks configured having standard columns (Subject, Escalated From, Sent Date, Priority, Attachments Status, Due Date).

Now we have to configure some other tasks which would be required to show custom column data.

I have personalized the UWL iView and am able to get the custom columns data as well.

Please suggest on configuring the sub-view such that when a particular task ID is selected from drop-down, only relevant work items are populated.

I have already used the following snippets to get the different work items in a drop-down list:

<AllowedFilters>

    <CompoundExpression logicalOperation="AND" defaultViewFilter="yes" referenceBundle="filter_display_all"/>  

    <CompoundExpression logicalOperation="AND" defaultViewFilter="yes" referenceBundle="ABC">

        <Expression name="externalType" value="TSXX000YYY" comparator="Contains"/>

    </CompoundExpression>

    <CompoundExpression logicalOperation="AND" defaultViewFilter="yes" referenceBundle="DEF">

        <Expression name="externalType" value="TSABC00ZZZ" comparator="Contains"/>

    </CompoundExpression>

    <CompoundExpression logicalOperation="AND" defaultViewFilter="yes" referenceBundle="GHI">

        <Expression name="externalType" value="TSDEF00YYY" comparator="Contains"/>

    </CompoundExpression>

</AllowedFilters>

Please let me know if there is any alternate way to get it done.

Secondly, when I select the TSXX000YYY from drop-down, the standard columns are visible only whereas for the rest the tasks all the columns (custom + standard) are visible.

Any help would be immensely appreciable.

Regards, Biswajit.