Shower Door Catch Is It Possible To Cut Larger Shower Door In A Pre-existing Shower?

Is it possible to cut larger shower door in a pre-existing shower? - shower door catch

Is it possible to cut a large shower door in an area of already existing, without thereby sealing shower water? I have a knee wall I will make an incision.
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Help! I take a shower, a new method was developed using floating tiles. Instead of putting the Council Hardi Backer on purple with chicken and mortar. It was dried hot shower pan. All tables have been installed, but now I found a big problem.
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Framed door of the cabin was too small. The Contractor shall, before the type of tile will be ready made. Are there ways to reduce the pony wall and make the door wider, but not risk to mortar in other areas (such as the 3 other walls or shower pan)?
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Do you have to throw the shower door to big? Or is there another way to make the door wider to threaten but not to the sealing of the shower already?
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What now? How do I solve this problem?Thanks in advance!