Here is an example of a sticky config. This will sticky on source address.
sticky ip-netmask 255.255.255.255 address source WebSeal_Sticky
replicate sticky
serverfarm WebSeal_Farm
Then apply it-
policy-map type loadbalance first-match WebSeal-Virtual-Server-l7slb
class class-default
sticky-serverfarm WebSeal_Sticky
policy-map type loadbalance first-match WebSeal_HTTPS-l7slb
class class-default
sticky-serverfarm WebSeal_Sticky
Also check out the configuration guide.
http://www.cisco.com/en/US/docs/app_ntwk_services/data_center_app_services/ace_appliances/vA3_1_0/configuration/device_manager/guide/dmguigd.html
Hope that helps.