Hi Buk (BROWSERUK)

Welcome to the MoI Forum.
In my experience, the folks on the forum are very helpful in assisting with modeling questions.
It is helpful to have an example .3dm to work from, and as a reference.

Draught angle, = draft angle, in injection molding, refers to the slight taper or angle added to the vertical walls of a mold or part, for easier removal.

The following link is a generalized CAD tutorial:
https://www.easycomposites.co.uk/learning/CAD-techniques-for-composite-mould-design

I am not aware of a "Draft Analysis tool" in MoI. Others may have ideas about checking Z-axis angles.

If you have an example part, other MoI users may have suggestions about how to modify the surfaces to supply the necessary draft angles.
Extruding and scaling might be useful commands?

We appreciate learning from yourself as well.

- Brian