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Currently there is no direct method to perform InsertCopiedCells functionality. Whereas, this can be achieved by a workaround in the usage level. We have prepared a sample illustrating this behavior which is just a modal and it can be downloaded from the following link. This can be enhanced depends on the requirement. Kindly refer to the sample and let us know if this helps.
Please let us know if you have concerns.
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We are able to reproduce the reported issue from our side This issue can be resolved by using MoveTo() instead of CopyTo() while moving existing cells to down in InsertCopiedCell(). The Sample which illustrates this behavior can be downloaded from following link.
While opening a generated excel file, a circular reference exception is thrown in MS Excel. We have logged defect report regarding this. A support incident to track the status of this defect has been created under your account. Please log on to our support website to check for further updates
Please let me know if you have any questions.