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1. Initially, identify which link or node in the model you want to place the expression function in.
2. Then, add a function in the node/link feature editor;
3. Exit the node/link feature editor;
4. In the Function manager, first assign a value to the function. Right click, then choose Edit function;
5. Back in the Function manager, right click on the required function again and choose Manually add function usage to open theMetaParameter Explorer;
6. Then add the function usage manually to allocate a parameter to the variable (steps outlined in Figure 1). You can now use the Command Line Runner to run the model iteratively while varying the parameter. This is also used for setting up a project to run with Insight: Objective Multi-objective optimisation.

Figure 1. Adding Function Usages Manually in the MetaParameter Explorer

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