How to draw out a height between 2 planes?

weidong_zhou931

I am new to onshape and in learning of this amazing tool through a free account now.

I imported an external step file and tried to modify/reduce the height of this case/box. I defined 2 additional planes and the gap is 1.5mm between them. I want to draw out the height of 1.5mm between these 2 planes. How can I do this in onshape?

Thanks in advance for any help! 

NeilCooke

You can Split the part using the planes and then Transform the top down, then Boolean. However, it would be easier to box-select the top faces and use Move Face.

weidong_zhou931

NeilCooke said:

You can Split the part using the planes and then Transform the top down, then Boolean. However, it would be easier to box-select the top faces and use Move Face.

Thanks for comments. Since I am really new to onshape so could you tell me how can I split a part by planes?
BTW, the reason why I choose 2 middle planes instead of top face moving, is to avoid interference with other features nearby. 

NeilCooke

https://cad.onshape.com/help/Content/splitpart.htm?Highlight=split

weidong_zhou931

NeilCooke said:

https://cad.onshape.com/help/Content/splitpart.htm?Highlight=split

Thanks for point out. I will check with that feature.