The safest way is to delete your VI's and VG's so that all the business rules run and clean out the related data too.
OR
You can avoid deleting when testing your group rules by deleting any offending groups and then running this script AS A FIX SCRIPT:
//Create a fix script under the Vulnerability Scope and run this after deleting the Vulnerability Groups you no longer want
var vgr = new sn_vul.VulnerableGroupRule()
var vi = new GlideRecord('sn_vul_vulnerable_item');
//add any queries you may want
vi.setLimit(100); //placed here to prevent a possible massive update that will impact performance. Remove when 100% sure your query is correct and you're prepared to let this run for a while
vi.query();
while (vi.next()) {
vgr.groupItemByVulnGroupRule(vi);
}
Assignments happen at the group level, so you should get new assignments for the group when the new ones are created.
Hope this helps.
