If you don't use forwarder management, you won't be able to use the UI to set up the input. My guess is you're using some other software to distribute configuration to your 90+ forwarders, you definitely shouldn't be doing that by hand. You'll have to use that software in whichever way it works to distribute the TA to your forwarders, but I can't tell you how that works precisely. At the end of the day, you need to have the TA and an appropriate input on the forwarder. What you could do is deploy the TA on a standalone splunk, set up the input and copy the resulting settings to the forwarders with your software.
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