You can apply a filter, or multiple filters, to control access to properties and values within a dimension.
In the image below, the Sales Rep dimension has been selected. You click the green plus button to add a filter, then configure the filter as follows:
Use Code to select properties to which you will apply the filter.
Use Equal To to select any values included in the filter.
Any value can be manually entered in the filter entry field. Selecting 'more' displays a list of values. Multiple values can be entered, separated by semi-colons (for example, 'AG;GH;KJ' would include the three values AG, GH and KJ).
Multiple filters can be created using a combination of the And/Or button, so you could create a filter that says 'Rep Code equals 001 or Rep Name equals FRED'. However, you can only specify filters against a single dimension (you cannot, for example, say 'Rep equals 001 OR Depot equals SE').