Using AD groups is easiest. The alternative is to use DMS, but it's either one or the other.
There are at least two ways. You can create a group in AD, add the users to that group. Then create a new folder on the filesystem and put the .qvw documents for the group in that folder. Give the AD group read access to the folder. Add the new folder to the mounted folders in the QMC. The users in the AD group will see the dashboards in the access point, other users won't.
It's also possible to use section access to grant access to a document. On the Server tab of the document properties window you can enable the option "Filter AccessPoint Document List Based on Section Access" to use the documents section access table to make sure only the right users will be able to see the document in the access point. You can create a common section access table, put that in a script file and include that script file in the load script of all the documents that the users of the group should see. This way you don't have to create a group in AD. But you can use AD groups in section access tables too.
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