On the preview page of Studio, the vertical and horzontal sliders both set at minimum, the Gcode always starts at 600, not zero or even one? What is the first 599 lines of Gcode? can I edit the Gcode?
Yes, you can edit Gcode. It is text so any editor can conceivably open it but you may need Notepad++ or similar editor which has the ability to open insanely huge documents.
The first 600 lines of Bambu Gcode include a lot of preamble setup data. Although its been a while since I last looked at it, it has all of the setup parameters needed to get the printer ready to print. What you see on the slicer screen I I am not mistaken, is the Gcode for only that layer. This is for ease of use otherwise, you’d want to use an editor.
Having said all that, the Gcode in the slicer has been parsed for safety. If you go mucking around with it and don’t know what you’re doing, you could easily force the nozzle to an x,y,z coordinate that will damage your printer such as trying to force the nozzle below the build plate. That doesn’t mean you shouldn’t give it a try, just be careful and have your finger over the pause button on the printers control panel just in case. 
There are some pretty cool functionality that is documented in this post if you care to play around.
Sure you can edit it. It’s not shown in preview section as it would muddy up the preview generation.
Jon;
This screen grab you show is labeled “Printer Settings” Where is this in Studio?
I have to caution you that editing any of the start/end gcode should only be done by someone with a good understanding and working knowledge of gcode. Edit at your own risk.
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Yeah but I think he was referring to the section before the main GCode. the Machine start and stop code if I am not mistaken and the other section “selectively” give you access to sections of the preamble.
It should also be noted that Bambu makes a concerted effort to obfuscate their GCode preamble to make it very, very difficult if not impossible to follow.
There are so many features on this machine compared to my Creality machines, My P1S works so fine, Keeping my hands off of some of these features is good advice, I will keep hands off, and I thank you guys for the information -