You write a matrix that's like:
meanG1T1, meanG2T1, meanG1T2, meanG2T2
upperboundCIG1T1, upperboundCIG2T1, upperboundG1T2, upperboundG2T2
lowerboundCIG2T1, etc etc etc
blah blah blah, or whatever makes sense for your data. Then in the "error bars" option of excel you can make select the fields for errors and can make asymmetric error bars.
I have a ppt I made on how to do this but I can't upload files on here 🙁