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I think you need to clarify if you are using maven or gradle. To add another project in gradle you can simply add it as an `include`  in your `settings.gradle`.

Since `settings.gradle` is scriptable it's just a simple if statement to exclude it based on that condition.

Of course as the question title, I am confused in a Gradle project.

Is there a simple guide for it? I am really a newbie of Gradle.

While it is most probably not a good idea, you can simply use an `if`, checking for a Gradle property. Both DSLs are Turing-complete languages.

what is the better solution, use a custom task for the specific requirement?

Hard to say generically, that heavily depends on the concrete situation.
Maybe a separate subproject could be appropriate.
Or maybe a feature variant.
Or really the `if`s.
Really hard to say.

I do this thru conditionally-included sub-configurations. I define a Gradle property and use this to decide which to `apply from`.
<https://github.com/sbabcoc/Selenium-Foundation/blob/master/build.gradle#L25>

This replicates Maven profiles pretty closely.