[replace scenery in existing scenario]

Goodevening all!Just a quick question, ive been building a park for quite a while now and now ive come across a slight problem.I wanne use some glass scenery and I didnt add it while I made the scenario (for some stupid reason).Now I really want to use it. Is their a way I can remove one scenery piece and add the glass scenery to my scenario?

[Remove scenario limitations]

I would love this...So how far are they with this build? or how long is it expecting to take?