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By clicking the delete icon in Action column in Available test cases table, user can delete the test case. 

For Delete Steps :

The user can delete multiple steps at once and the user can click the check box that is positioned above to the Pre step, Step and Post step in order to delete the steps. Additionally, the user can delete the individual step by selecting the respective test step by clicking its check box and clicking the Delete Steps button. 
1. The user can select the check box to delete the steps.
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2. After selecting the steps in check box user should click the Delete Steps button to delete the steps
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Baseline Device Models
When user wants to add a new device model in an existing test case then the user can make use of Baseline Device Models feature. The user need to select two devices, one is the new device model that is not present in the existing test case and another one is the reference device model. The reference device model will act as an indicator in which the new device model will be added to the test steps where the reference model is present. This allows user to add the new device model to each step in the testcase.  

Below are the steps to add a new device model to an existing script, where "ABC" is the new device model and "XYZ" is the existing device model:

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