''flow_groupresize: <group id> | <size>''

Allows you to resize a group within the show flow directly from code - as opposed to the data being manually entered via a remote interface. 
  * **group id** is the group id of the group to be resized - you would normally use a variable reference to ''zone.groupid'' here.
  * **size** is the new size to apply to the group

For example, say audience members check in in the first zone with a particular interaction - every time that interaction runs, you increment a variable:

''increment: zone1.interactions | 1''

Then, at the end of the sequence you would call:

''flow_groupsize: $zone1.groupid | zone1.interactions''