Group operations is of the main mechanisms for dealing with larger models. Network objects can be grouped together and can be made visible or invisible on a given page (tab). Combined with multiple pages this provides a convinient means for providing several complementary views of the same model. In the simplest scenario one group can correspond to a single page, but in general there is no one-to-one correspondence between the pages and the groups. For example, the same group can be made visible on several pages, and several groups can be visible on the same page.
Groups can be connected by transitions and fused places. A set of fused places act a single place from a simulation perspective, but each of the places from that set can belong to several different groups (and pages) from the graphical perspective (several fusedd places can belong to the same group as well.
Initially, there is only one default group 0 that is shown.
Groups can be hidden and shown (those are actions specific to a page, so each page can have its collection of visible groups (subnets).
When a new subnet is created, it is empty, so selecting "Add Place" mode (on the bottom of the option windows) allows adding places to a subnet.
Removing places from a group results in the adding those places to the default group.
Tokens, outgoing transitions, and triggers are "owned" by a place for the purposes of assigning an object to a group (so they move between the groups together with the place).
Removing a subnet results to merging all of its content with the group 0.
When "Add from File" option is used, models are appended in terms of pages and subgroups. For example, if the original model had two pages and three groups, then adding a single page model with a single group results in three pages and four groups.
Adding a new page results in creation of a new group if the number of groups is less than the new number of pages. So if you start with a single page you have two groups no additional groups are created, but if you have only one group then the second group is automatically created with the page (and objects can be added to it).
Deleting pages does not delete subgroups (some might be hidden for all pages).
Delete Subnet and its Content button does exactly what is says - use with caution. It provides a means to remove large portions of a model fast.
Move subgroup allows changing position of the entire subnet. This provides a quick way to adjust the global position of the model.
Pressing OK button dismisses the dialog, while pressing "Help" button opens up this help page.
Groups