Automatically grouping shapefile based on name

Hi there ,

i m not sure if if have put this in the right forum. If you think it be better somewhere else please advise

i have a lot of shape files , which have a name a standard name.

The name shows the year , the company and catogery

Some examples names would be 1999_ford_2 , 1998_nissan_3, 2008_toyota_5

I Have lots of these shapefiles. i would like to have groups that show the company

At the moment i am making a group layer , putting the company name in

i was wondeirng if there is any way of making this process automatic .