[O] Org publish restrict to certain levels

[Xin Shi]

Hello Experts,

I have a relatively long and detailed document maintained in org but only won't to publish into LaTeX to the first 3 levels, because the rest of the levels are too many details. If I use COMMENT into every of them, looks very cumbersome. I'm wondering if there is any in-file config to enable this. 

Thanks!

Xin