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# Assigning Codelists to Leaf Nodes
You can assign codelists to any leaf node of your choice.
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## Prerequisites
You’ve opened the Message Implementation Guideline \(MIG\) in edit mode.
You've included the leaf node that you want to assign a codelist to in your MIG by selecting it.
## Procedure
1. On the *Structure* tab, select the leaf node that you want to assign a codelist to.
2. Choose the *Codelist* tab in the resulting panel.
3. Choose the add :heavy_plus_sign: icon to select a codelist through one of the following options.
- Choose *MIG Codelists*, if you want to assign a MIG codelist to the leaf node.
- Choose *From Type System* and select the desired codelist from the drop-down box, if you want to assign a type system-based codelist to the leaf node.
- Choose *From Custom Type System* and select the desired custom type system from the drop-down field nearby. On selecting the custom codelists, the list of available codelists will be displayed in the table below. Choose the relevant codelist from the list.
The *Selected Codelist* drop down box shows the list of codelists assigned to the leaf node.
> ### Note:
> There can only be one active codelist for a node at any given time and it's the one selected in the drop-down box.
4. You can select or deselect the code values as required.
5. You can search the code values using the following search options:
1. *Search*: This is a generic search field
2. *ID*: Search for a specific code value ID using this field. You need to enter the exact ID value here for the search to work.
3. *Name*: Search for a specific code value using their here. You can enter partial/full name of the code value and the search function will provide the results accordingly.
4. *Definition*: Search for a specific code value using their definition here. You can enter partial/full definition of the code value and the search function will provide the results accordingly.
6. To clear the search filters, choose *Reset*.
7. Optional: You can choose to use a code value as an example value by choosing :heavy_plus_sign:icon.
8. Optional: You can switch between codelists by selecting the desired codelist from the *Selected Codelist* drop down box.
9. Optional: You can disassociate a codelist from a leaf node by selecting *None* in the *Selected Codelist* drop down box.
