How to scale down the model with features?

Hi,

I would like to scale down model in solidworks. I have attached the model here. In sketch 1, instead of having 10 mm * 10 mm square, i would like to have 0.3 mm * 0.3 mm square and instead of 20 mm (in Boss-Extrude 1), i want it to be 0.5 mm. How can i change the dimension such that all the features stay valid and final model would be exactly same as original one, only dimension would be different.

Thanks in advance.

Regards,

JP