diff --git a/src/gui_qt/fit/fit_forms.py b/src/gui_qt/fit/fit_forms.py
index ed215cf..db7561d 100644
--- a/src/gui_qt/fit/fit_forms.py
+++ b/src/gui_qt/fit/fit_forms.py
@@ -13,6 +13,7 @@ class FitModelWidget(QtWidgets.QWidget, Ui_FitParameter):
     value_requested = QtCore.pyqtSignal(object)
     value_changed = QtCore.pyqtSignal(str)
     state_changed = QtCore.pyqtSignal()
+    replace_single_value = QtCore.pyqtSignal(object)
 
     def __init__(self, label: str = 'Fitparameter', parent=None, fixed: bool = False):
         super().__init__(parent)
@@ -32,6 +33,7 @@ class FitModelWidget(QtWidgets.QWidget, Ui_FitParameter):
         self.checkBox.stateChanged.connect(self.enableBounds)
         self.global_checkbox.stateChanged.connect(lambda: self.state_changed.emit())
         self.parameter_line.values_requested.connect(lambda: self.value_requested.emit(self))
+        self.parameter_line.replace_single_values.connect(lambda: self.replace_single_value.emit(None))
         self.parameter_line.editingFinished.connect(lambda: self.value_changed.emit(self.parameter_line.text()))
         self.fixed_check.toggled.connect(self.set_fixed)
 
diff --git a/src/gui_qt/fit/fit_parameter.py b/src/gui_qt/fit/fit_parameter.py
index 3229f10..6c3ec60 100644
--- a/src/gui_qt/fit/fit_parameter.py
+++ b/src/gui_qt/fit/fit_parameter.py
@@ -78,6 +78,7 @@ class QFitParameterWidget(QtWidgets.QWidget, Ui_FormFit):
             widgt.state_changed.connect(self.make_global)
             widgt.value_requested.connect(self.look_for_value)
             widgt.value_changed.connect(self.change_global_parameter)
+            widgt.replace_single_value.connect(self.delete_single_parameter)
 
             self.global_parameter.append(widgt)
             self.scrollwidget.layout().addWidget(widgt)
@@ -148,6 +149,13 @@ class QFitParameterWidget(QtWidgets.QWidget, Ui_FormFit):
         if value is None:
             self.change_data(self.comboBox.currentIndex())
 
+    def delete_single_parameter(self):
+        idx = self.global_parameter.index(self.sender())
+        for i in range(self.comboBox.count()):
+            set_id = self.comboBox.itemData(i)
+            self.data_values[set_id][idx] = None
+        self.change_data(self.comboBox.currentIndex())
+
     def change_single_choice(self, _, value, sender=None):
         if sender is None:
             sender = self.sender()
diff --git a/src/gui_qt/lib/forms.py b/src/gui_qt/lib/forms.py
index c0b73aa..ab20ce3 100644
--- a/src/gui_qt/lib/forms.py
+++ b/src/gui_qt/lib/forms.py
@@ -52,19 +52,24 @@ class QDelayWidget(QtWidgets.QWidget):
 
 class LineEdit(QtWidgets.QLineEdit):
     values_requested = QtCore.pyqtSignal()
+    replace_single_values = QtCore.pyqtSignal()
 
     def __init__(self, parent=None):
         super().__init__(parent=parent)
 
     def contextMenuEvent(self, evt):
         menu = self.createStandardContextMenu()
-        request_action = menu.addAction('Use value of sets')
+        request_action = menu.addAction('Use numeric value of sets')
+        set_value_action = menu.addAction('Replace single set values')
 
         action = menu.exec(evt.globalPos())
 
         if action == request_action:
             self.values_requested.emit()
 
+        elif action == set_value_action:
+            self.replace_single_values.emit()
+
 
 class LineEditPost(QtWidgets.QLineEdit):
     values_requested = QtCore.pyqtSignal()