Assignment %tage maintain in a column

My project has 8 ressources. I assign them by %tage to relevant tasks. Currently, I do this by rightclicking on the task, then selecting Resources and then assigning the resources.

Please explain, if I can do this in columns instead? I would then hav 8 columns, and in each column (NeXT to a particular task), Id write a number 1-100 indicating the percent of his/her time the ressource shall Work on that task.

Thanks in advance!

BW Peter B Hansen