1.)Go ahead and define the related list of any records you want at the bottom of the form.(For example, A simple
defined related list may be placed on the room from that
lists other rooms on the same floor).
Related lists appear on forms and show records in tables that have relationships to the current record.
Users can view and modify information in related lists like any other list.
2.)Go ahead and 2 different columns in one of the existing user tables.Consider any datatype for newly added fields.
created two different types of data fields, Time/date and True/False.
3.) Define navigation steps to identify dictionary of any table in ServiceNow.
Navigater->Tables->Select required table from the table->Right click on the bar->Select configure->Click on Dictionary.
