There is a sidebox called:
/includes/modules/sideboxes/banner_box_all.php
/includes/templates/templates_default/sideboxes/tpl_banner_box_all.php
You could clone that so you have two of them ...
Then you can make your banners and assign them to the BannersAll group for one of the sets and assign them to a new group BannersAll2 ...
To get the new group to work for you via the Admin you can use:
Code:
INSERT INTO configuration (configuration_title, configuration_key, configuration_value, configuration_description, configuration_group_id, sort_order, use_function, set_function, date_added) VALUES ('Banner Display Group - Side Box banner_box_all2', 'SHOW_BANNERS_GROUP_SET_ALL2', 'BannersAll2', 'The Banner Display Group may only be from one (1) Banner Group for the Banner All2 sidebox<br /><br />Default Group is BannersAll2<br /><br />What Banner Group do you want to use in the Side Box - banner_box_all?<br />Leave blank for none', '19', '73', '', '', now());
and that will show in the Configuration ... Layout Settings ...