First of all, until, what do you mean by boundary? If you mean the 30cm edge pattern, and your billboard has built-in lights, then I suggest you cancel this plan, because it is normal to print 20 ~ 30cm more 10M. Of course, it would be better if it is peripheral lighting, because this problem can be solved by puzzles.

The general practice of 6mX 10m billboard is to create a cmyk mode file with the size of 640X 1040cm and the resolution of 20, and then set a reference line with 40cm around it, which is the bleeding position. The key content can't be put in, so just do the rest.

As for the 30cm frame you mentioned, if it's a pattern, if it's a color block, the size must be 50cm. If it's a stripe or something, you must sit 40cm or more outside the bleeding position.