Lock the aspect of ONLY some but not all elements of a grouped object?

Hello,

I have been learning how to edit and create vectorial figures in CorelDraw in the last year, and it's probably the best way to do them I've ever come across.

I was wondering if this last thing I'd like to do is possible in CorelDraw X6.

I am editing a vectorial figure of a ternary plot (random example from internet here). What I would like to do is to resize/reshape the triangle in a non-proportional way (i.e., to make it non-equilateral) while all the points and shapes corresponding to the values of the points (on the example above, the circles, etc) remain unchanged. The final figure I would like to get is a triangle that is not equilateral, filled with circles that still look like circles and not ellipses because I would have reshaped the whole thing.

In other words, is there a way to lock the aspect of some elements of a grouped object, and to resize the grouped object without these elements' aspect to be reshaped)?

I hope I was clear, many thanks in advance for your help and your time.

HF.