the options : This is a parametrized project comes greyed out while working with multi branch pipeline prject. Let me know how we can build with parameters in this situation.
See the Jenkins Minute video at
See also the “Handling Parameters” section of
Click the link on the page that says “toggle scripted Pipeline”
Alternately, read this article that describes how you can use the snippet generator to define the properties of the job. One of the properties is the parameters of the job.