Hello,
create an 'execute process task'.
In Process / Executeable insert the execute (...winzip.exe )
In Expressions select the property Arguments. Here you insert
"-a -ex zipfile.zip examplefile".
A better approach is to work with variables for zipfile.zip and examplefile i.e.
"-a -ex " + @[user::zipfile] + " " + @[user::file]