Can wildcard '*' be used in section access ton restrict data?
Unfortunately, there's not. You can either set all the possible values in section access or in any other table related to a group, out of the section access. Say that in section access you associate each user to a group (Sales, HR, Marketing) and this group is the reduction field.
Then, you assign to each group the numbers corresponding to them (say 1* for Sales, 2* for HR, 3* for marketing and so on). But in both cases all values must be listed.