You can probably do this using a V-Cut but there are a number of restrictions on how they can be used. They must cross the whole board. They cannot start or end inside a board outline. I can't find the topic now but there was a recent post about certain conditions where V-Cuts cannot be used in panelisation to separate boards. So even though this may not be how you wish to use them, it may still restrict you if you want to panelise the boards.

Sadly the V-Cut isnt cutting it :( I dont understand that i see PCI Slot boards on this system and there are Footprints but it feels like they just ignored the Chamfer is it case i have to get a 1.6mm board and then Chamfer each side myself with a 0.5mm (OMG 1/2mm !!) each side making it 1.5mm at the point

You are correct: a V-Cut lone dies not cut all the way through the board. But, if you place a V-Cut line along the end of the gold PCI edge fingers then when you snap off the end of the PCB,  it will leave the 45 degree profile as shown in your picture, that you want.

"... a V-Cut line does not..."

Here's an example of using a V-Cut (not exactly the way you want but it shows what I am trying to describe):  The horizontal Board Outline line produces a V-Cut. The highlighted element is a vertical Multilayer Board Cutout. In other words it produces a slot in the board. So the region containing LED2 and JP17 can be snapped off along the horizontal V-Cut line leaving the part of the board to the left of the slot still attached to the main PCB (in my application this was also snapped off but that does not matter here). If you were to look closely at the snapped off edge along the line of the V-Cut, you would see something that looks like the images here: [https://www.multi-circuit-boards.eu/en/pcb-design-aid/mechanics/v-scoring.html](https://www.multi-circuit-boards.eu/en/pcb-design-aid/mechanics/v-scoring.html)<br> <br> This is almost what you want but I think you are right: you would still need to post-process the board edges to change the angle from the V-Cut of about 30 degrees to achieve a 45 degree angle. :(