So.. for all you guys that didn't know how to make bitmap tags with more than one mipmap in it here it is...
First of all... you must already have all bitmaps that you want to fuse into a single bitmap tag finished already.
Step 1: Reference
I'm using the forerunner tif file for reference. note that blue borders separate the bitmaps in the file. (You can use any other cubemap as reference)

Step 2: Cut/Copy
I tried making a new cubemap tag so my bitmaps WILL be different from yours. my "fire" looking bitmaps are what your bitmaps are suppossed to be crosshair bitmaps.

Step 3: Pasting your bitmaps into your reference file
Self Explanitory.. try to cut/copy the part of the bitmap of each of your bitmaps files so that it would just fit in ur reference file (the forerunner is my reference file)

Step 4: Save
After you've filled in all six squares in your reference file with your custom bitmap, your ready to save... Save it in a directory where tool.exe will be able to compile it as a bitmap tag.. here's the directory I saved it in: C:\Program Files\Microsoft Games\Halo Custom Edition\data\levels\test\bitmaps\bitmaps

Step 5: The Command for Tool.exe
Type in this in a .bat file (make sure the .bat file is in ur main halo ce directory)
Tool.exe bitmap levels\test\(your folder name)\(your folder name\(name of the .tif file)
pause
here's what I put in as the commmand:
Tool.exe bitmap levels\test\bitmaps\bitmaps\cubemap_fire
pause

Step 6: Fusing the .tif file's bitmaps into one bitmap tag with multiple mipmaps
here's what it should say except some of the words will be replaced with your directory.

Step 7: How it should turn out
this is how the .bitmap tag should turn out in gurilla. as you can see it as ore than one mipmap...

*this is the 1st tutorial i've writen sorry if u were confused at any part. PM me to get on AIM if you need any help with this... This is also how you make custom crosshairs...[/img]