SQL*Loader POSITION clause question

I have a simple question about SQL*Loader. We are in the process of converting to Oracle and I'm working on interfaces to our legacy systems. What I'm wondering is can I concatenate data from two or more positions within my INFILE record and load them into a single column? Example:

My INFILE record looks like this:

XX1234-56-78XXXX My control file needs to do something like this (eliminating the hyphens):

INTO TABLE mytable
(
..
mycolumn1 POSITION ....,
mycolumn2 POSITION (3:6) + POSITION (8:9) + POSITION (11:12), mycolumn3 POSITION
)

where mycolumn2 is made up of more than one POSITION clause. I'm trying to sift through the Utilities User's Manual but I can't seem to find an example describing this type of manipulation. Thanks in advance!

Tim Wendt
AT&T Global Information Solutions