Hi Deepak,
So if I have understood you correctly, you will have to manually merge the
appropriate tehsils.

Here is a page which talks how you can manually merge polygons while
editing them in QGIS:
http://blog.thematicmapping.org/2013/06/merging-polygons-in-qgis.html

Regards,
Dev



On Sat, Aug 8, 2015 at 8:38 AM, Deepak B <deep19882...@gmail.com> wrote:

> @ Dev - I am trying to get a unit which is a go-between Tehsil (Block) and
> district... This is how districts are classified in India's National
> Tuberculosis program. It is known as "Tuberculosis Unit"
>               For example - A district X has 10 tehsils/blocks and few
> adjacent blocks are combined to get 4 units, which is the functional
> division
>
>               I did try with my sparse qGIS knowledge and couldn't find a
> solution :-(
>
> @ Yogi - Thanks for your reply. I did try your suggestion and used the
> "Union" tool. But it didn't work out. Maybe my steps were wrong, so i plan
> to go through some youtube tutorials and see if i got the steps right :-)
>
> Regards
> Deepak B
>
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Regards,
Devdatta

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