It is not possible to select an existing form when you add a form onto a page in Sitecore 8.0 update 3 or earlier versions.
One option is to upgrade your Sitecore instance to 8.0 Update 6, in which this option was added, but be aware that there were a number of other big changes in this release including a number of code changes and updates to the front-end framework to use Bootstrap which may require you to spend a significant time updating your styling to fix this.
An alternative is to override the Form Selector and provide your own implementation to add a "Use existing form" option. I have previously written a blog post on this exact thing for Sitecore 8.0 Update-3
Steps to override the Form Selector
Make a copy of /sitecore/shell/Applications/Modules/Web Forms for Marketers/InsertFormWizard.xml and copy it to /sitecore/shell/Override folder.
Update the file to change the
Codebeside tag to point to your implementation:
<WizardForm Application="Modules/Web Forms for Marketers/Insert Form Wizard" CodeBeside="MyProject.Custom.WFFM.UI.InsertFormWizard, MyProject.Custom">
Add a new RadioButton that will allow selection for existing forms:
<Radiobutton ID="ChooseExistingForm" Name="ChooseOperation" Value="existing"/>
And create a Class that for the code behind. You want to check if the new "Existing Form" option has been selected and if so vary the wizard page shown appropriately:
public class InsertFormWizard : Sitecore.Forms.Shell.UI.InsertFormWizard
protected Radiobutton ChooseExistingForm;
protected override bool ActivePageChanging(string page, ref string newpage)
if (newpage == "SelectPlaceholder" && page == "SelectForm" && this.ChooseExistingForm.Checked)
newpage = string.IsNullOrEmpty(base.Placeholder) ? "SelectPlaceholder" : "ConfirmationPage";
if (this.ChooseExistingForm.Checked && newpage == "AnalyticsPage")
newpage = "ConfirmationPage";
return base.ActivePageChanging(page, ref newpage);
protected override void OnNext(object sender, EventArgs formEventArgs)
if (this.NextButton.Header == "Confirm" && this.ChooseExistingForm.Checked)
private void SaveExistingFormSelection()
Item source = ExistingFormSelection();
this.ServerProperties[this.newFormUri] = source.Uri.ToString();
private Item ExistingFormSelection()
string queryString = Sitecore.Web.WebUtil.GetQueryString("la");
Language result = Context.ContentLanguage;
Language.TryParse(Sitecore.Web.WebUtil.GetQueryString("la"), out result);
Item source = this.FormsRoot.Database.GetItem(this.multiTree.Selected, result);
The above is the minimum code required to make this work. I suggest reading the blog post for a more thorough explanation and the full code is also available in this Github Gist.
The user will now have the option to select an existing form using the wizard.