Hey Sid,
If you mean NumPad 1 through 9, view angles only, you can read up on that in the FS2004 SDK. It can get a bit detailed. But the settings are set (in FS2004) in the top portion of the Panel.cfg file.
You have 3 strings you can use for each view, only one is needed, if any at all.
Now, if you wish to add screenshots (like interior photos with windows blacked out with pure black) then you really need FS Panel Studio to add those in. The screenshots would go in the Panel folder. You 'could' adopt in another copy/pasted section from another plane and adapt it to yours. Then adjust to suit your needs.
Here is one of mine for the Trinidad. Note, I also use NumPad 5 with 1 thru 9, such as NumPad 5&4 for belly view, etc.. (Usually that would be left up).
[VIEWS]
VIEW_FORWARD_WINDOWS=MAIN_PANEL,50,GPS_PANEL,10,242,36,36,360
VIEW_FORWARD_ZOOM=0.800
VIEW_FORWARD_EYE=0.000, 0.000, 0.000
VIEW_FORWARD_DIR=4.000, 0.000, 0.000
VIEW_FORWARD_RIGHT_ZOOM=0.800
VIEW_FORWARD_RIGHT_EYE=0.000, 0.000, 0.000
VIEW_FORWARD_RIGHT_DIR=3.000, 0.000, 45.000
VIEW_RIGHT_ZOOM=0.800
VIEW_RIGHT_EYE=0.000, 0.000, 0.100
VIEW_REAR_RIGHT_ZOOM=0.400
VIEW_REAR_RIGHT_EYE=0.100, 0.000, 0.000
VIEW_REAR_RIGHT_DIR=0.000, 0.000, 140.000
VIEW_REAR_ZOOM=0.250
VIEW_REAR_EYE=0.300, 0.000, 0.600
VIEW_REAR_DIR=35.200, 0.000, 180.000
VIEW_REAR_LEFT_ZOOM=0.600
VIEW_REAR_LEFT_EYE=-0.750, 0.000, 2.000
VIEW_REAR_LEFT_DIR=0.000, 0.000, -172.000
VIEW_LEFT_ZOOM=0.800
VIEW_LEFT_EYE=0.000, 0.000, 0.100
VIEW_FORWARD_LEFT_ZOOM=0.800
VIEW_FORWARD_LEFT_EYE=-0.100, 0.000, 0.000
VIEW_FORWARD_LEFT_DIR=4.500, 0.000, 315.000
VIEW_FORWARD_UP_ZOOM=0.500
VIEW_FORWARD_UP_EYE=0.300, -0.200, 8.000
VIEW_FORWARD_UP_DIR=0.000, 0.000, 180.000
VIEW_FORWARD_RIGHT_UP_ZOOM=1.700
VIEW_FORWARD_RIGHT_UP_EYE=0.000, -0.300, 0.150
VIEW_RIGHT_UP_ZOOM=0.500
VIEW_RIGHT_UP_EYE=0.350, 3.075, -8.200
VIEW_RIGHT_UP_DIR=30.200, 0.000, 0.800
VIEW_REAR_RIGHT_UP_ZOOM=0.300
VIEW_REAR_RIGHT_UP_EYE=0.700, 0.040, -0.600
VIEW_REAR_RIGHT_UP_DIR=30.000, 0.000, 310.000
VIEW_REAR_UP_ZOOM=0.400
VIEW_REAR_UP_EYE=0.300, 0.000, -0.900
VIEW_REAR_UP_DIR=20.000, 0.000, 0.000
VIEW_REAR_LEFT_UP_ZOOM=0.700
VIEW_REAR_LEFT_UP_EYE=-6.000, 0.300, -6.000
VIEW_REAR_LEFT_UP_DIR=0.000, 0.000, 45.000
VIEW_LEFT_UP_ZOOM=0.600
VIEW_LEFT_UP_EYE=0.300, -1.000, -3.200
VIEW_LEFT_UP_DIR=0.000, 0.000, 0.180
VIEW_FORWARD_LEFT_UP_ZOOM=0.700
VIEW_FORWARD_LEFT_UP_EYE=-1.000, 0.450, 1.900
VIEW_FORWARD_LEFT_UP_DIR=30.000, 0.000, 90.000
VIEW_DOWN_ZOOM=0.500
VIEW_DOWN_EYE=0.000, 1.000, 3.000
VIEW_DOWN_DIR=15.000, 0.000, 0.000
You can paste the above into a Panel config file (under the list and above the Windows sections) and see how they function in FS, before you start messing with them.
That will give you an idea how they work.. They are in degrees (mostly) with zero being straigh ahead, 180 being opposite direction, and in sections of X, Y, Z.
Looks a bit difficult. You'll get the hang of it though. Just start adjusting them, (one at a time), saving, then rebooting to see how they are effected in the sim.
Note, some are a bit radical, like a back rear seat view, a belly view, a rudder view looking down and forward like a rudder cam shot, etc...
Bill