2D Planning - switching from imperial to metric dimensions

Hi, I’m doing plans in 2D and I have done all my plans in imperial dimensions
The model units as well are in imperial
I need to change all the dimensions to metric instead of imperial … can someone tell me how to do this?
There are a about 12 plans full of measurements would be much easier than to manually change it!

Thanks

Mel

Right click on the file units and click unit settings. Then just switch your model units with the drop down and press OK. Press OK when it asks you to scale units. You can also reach this option from Tools>Options>Document Properties>Units