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I need to claim 7500 USD tax credit for electric vehicle for FY2018"
You are not going to like this answer, but I believe you are going to have to download Form 8936, prepare it manually, attach it to your return, and paper file.
In TurboTax Business, you can enter the credit in Schedule K using Forms Mode (see first screenshot). You should then see the credit propagate to your K-1(s) (see second screenshot - note there are two shareholders in my test return).
There is an outside chance that the form will be added to TurboTax Business at some point but I would absolutely not count on that, particularly since it does not appear to be supported by Intuit's ProSeries software.
Note that if you have the appropriate PDF software, you might be able to combine your 8453-S with your 8936 (i.e., scan both completed forms, combine them into one file, and upload that file to TurboTax Business) and then e-file.
