Given your data, looks like you don't need to customize the collection.  
Just add the view tag below it.

On a side note, you might want to take look through the dryml guide at some 
point as copying the whole show-page def isn't the dryest way to proceed. 
http://cookbook.hobocentral.net/manual/dryml-guide  You can extend the tag 
instead and just replace/add the bits you need to change.  By the way, this 
is not a requirement, just a suggestion that will make dryml pleasanter to 
work with in the long run.

As an example, if adding the sum is the only change to make you could do:

<extend tag="show-page" for="Proyecto">
  <old-show-page merge>
    <after-collection:>
      Total: <view field="plan_operativos.sum(:cant)" />
    </after-collection:>
  </old-show-page>
</extend>

Or even add app/views/proyectos/show.dryml if this is your only show-page 
for proyecto:

<show-page>
  <after-collection:>
    Total: <view field="plan_operativos.sum(:cant)" />
  </after-collection:>
</show-page>

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