__Can I merge one large Bitmap image into another?

__Can I merge one large Bitmap image into another?
I have 2 very large hi-res Bitmaps that I want to merge together into 1 file without converting to grayscale or anything. The problem is the second Bitmap is like a 'patch' and I want to insert it into the other like a puzzle piece, while maintaining corect registration (the bitmaps combine to a 4 colour seperation).
Thanks in advance!

1bit Bitmap offers no layer capabilities so going through grayscale seems advisable. (Edit: Naturally one should at the end of the combination process convert to bitmap again.)
Other than that you could after pasting remove parts of the pasted content with the selection tools (setting them to subtract with alt).

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