Load multiple files into a table

Hi,

I need to load data from two files to a single table.
My requirement is that I get two files in which a few column data are manadatory.
These files are identified based on the file name.
For example, I have two files ABCFile and BCDFile. ABCFile has mandatory data in column 3 and 4 whereas, BCDFile has mandatory data in 5th column.
So I have to validate whether these columns are null before inserting.
I know I can do it by creating 2 control files but is there any way to do it using one control file?