The Rules tab lists all currently available rules. These can be used to map Tasks to items in the model. Each of the default rules can be edited and new rules may be added as necessary:

Items By Task Name . Choose this rule to attach each Item in the model to each Task with the same name in the specified column. The default is to use the Task Name column. See >Editing TimeLiner rules for information on editing this rule.
Selection Sets By Task Name . Choose this rule to attach each Selection Set in the model to each Task with the same name in the specified column. The default is to use the Task Name column. See >Editing TimeLiner rules for information on editing this rule.
Layers By Task Name . Choose this rule to attach each Layer in the model to each Task with the same name in the specified column. The default is to use the Task Name column. See >Editing TimeLiner rules for information on editing this rule.
Attach Items to Task by Category/Property
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Choose this rule to attach each Item in the model with the defined property, to each
Task with the same name in the specified column. The default is to use the
Task Name
column, however you will also need to define the
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To edit an existing rule, click the Edit button and the Rules Editor will be displayed for the selected rule. See >Adding custom TimeLiner rules for information on the available options.
From the Rules tab of the TimeLiner control bar, click the New button.
The Rules Editor dialog is displayed:

Enter a new name for your rule in the Rule name box.
If you choose not to enter a name, upon selecting a rule template the name of that template will be used.
From the Rule templates list, choose a template from which your rule will be based upon.
The Attach Items to Tasks template is that used for the first three pre-defined TimeLiner rules, (Items, Selection Sets and Layers By Task Name).
The Attach Items to Tasks by Category/Property template enables you to specify a property within the model scene. If a task has the same name as the specified property value in the model, then all items having that property will be attached to that task when you check the rule Attach Items to Tasks by Category/Property , and click Apply Rules
In the Rule description box, click on each of the underlined values to define your custom rule. The customizable values available with the built in templates are:
Column Name . Choose which column in the Tasks tab you wish to compare Item names to. The default is the Task Name , though you may also choose one of the ten User columns, identified in the Field Selector
Items . Choose what you would like the value in the Column Name to be compared to in the model scene. The default is Item name, though you may also choose either Selection Sets or Layers
Matching . Use case sensitivity and therefore only match names that are exactly the same. You may also choose Ignoring to ignore case sensitivity.
Category/Property Name . Use the name of the category or property as it is displayed in the interface (recommended). You can also choose Internal Name which is that accessed via the API (for advanced use only).
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Click OK to add the new TimeLiner rule, or Cancel to return to JetStream.
Check the rules you want to use and press Apply Rules to apply them. The rules will be applied in order and will attach items to any Tasks without attached items.
If Override current selections is checked, then when the rules are applied they will replace any existing attached items.
To delete an existing rule, click Delete and the selected rule will be removed.