Project myProject = m_oProject; // A valid project
Page myPage = myProject.Pages[0]; // A valid Page object

DMObjectsFinder objFinder = new DMObjectsFinder(myProject);

// Get all functions in the myProject Project
Function[] functions = objFinder.GetFunctions(null);

// Use a filter to get only functions with category 'Motor'
FunctionsFilter myFunctionsFilter = new FunctionsFilter();
myFunctionsFilter.FunctionCategory = Eplan.EplApi.Base.Enums.FunctionCategory.Motor;
myFunctionsFilter.Page = myPage;

// Place all functions with category 'Motor' on page myPage
functions = objFinder.GetFunctions(myFunctionsFilter);