Unfortunately this is not possible. However, it can be done manually doing a simple copy and paste.
In Excel: Highlight your symbol column, right click and then click on copy.
In eSignal: Open a quote window then go to the top of eSignal and then click on Edit then Paste.
For more information on using Excel with eSignal, click on the following link: Excel This article and a lot of other usefull articles can be found in our eSignal KnowledgeBase
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