diff --git a/core/src/document/manager.rs b/core/src/document/manager.rs
index 2b13570..cbc83c9 100644
--- a/core/src/document/manager.rs
+++ b/core/src/document/manager.rs
@@ -44,6 +44,18 @@ pub enum DocumentCommand {
     NavigatePrevious,
     /// Select a specific item by index in the active session.
     SelectItem(usize),
+    /// Copy an item from one session to another.
+    CopyItemToSession {
+        source_session: String,
+        target_session: String,
+        source_item_index: usize,
+        target_item_index: Option<usize>,
+    },
+    /// Delete an item from a session.
+    DeleteItemFromSession {
+        session: String,
+        item_index: Option<usize>,
+    },
 }
 
 pub struct DocumentManager {
@@ -101,6 +113,27 @@ impl DocumentManager {
             DocumentCommand::NavigateNext => self.next(),
             DocumentCommand::NavigatePrevious => self.previous(),
             DocumentCommand::SelectItem(index) => self.select_item(index),
+
+            DocumentCommand::CopyItemToSession {
+                source_session,
+                target_session,
+                source_item_index,
+                target_item_index,
+            } => {
+                self.copy_item_to_session(
+                    &source_session,
+                    &target_session,
+                    source_item_index,
+                    target_item_index,
+                );
+            }
+
+            DocumentCommand::DeleteItemFromSession {
+                session,
+                item_index,
+            } => {
+                self.delete_item_from_session(&session, item_index);
+            }
         }
     }
 
@@ -220,4 +253,109 @@ impl DocumentManager {
             }
         }
     }
+
+    fn copy_item_to_session(
+        &mut self,
+        source_session: &str,
+        target_session: &str,
+        source_item_index: usize,
+        target_item_index: Option<usize>,
+    ) {
+        let source = match self.session(source_session) {
+            Some(s) => s,
+            None => {
+                self.state = DocumentState::Error(Error::Session(format!(
+                    "Session '{}' not found",
+                    source_session
+                )));
+                return;
+            }
+        };
+
+        let target = match self.session(target_session) {
+            Some(s) => s,
+            None => {
+                self.state = DocumentState::Error(Error::Session(format!(
+                    "Session '{}' not found",
+                    target_session
+                )));
+                return;
+            }
+        };
+
+        if target.kind != SessionKind::DocumentCollection {
+            self.state = DocumentState::Error(Error::Session(
+                "Target must be a DocumentCollection".to_string(),
+            ));
+            return;
+        }
+
+        let item = match source.items.get(source_item_index) {
+            Some(item) => item.clone(),
+            None => {
+                return;
+            }
+        };
+
+        if target
+            .items
+            .iter()
+            .any(|i| i.path == item.path && i.page_index == item.page_index)
+        {
+            self.state = DocumentState::Error(Error::Session("Item already exists".to_string()));
+            return;
+        }
+
+        let insert_index = match target_item_index {
+            Some(idx) if idx <= target.items.len() => idx,
+            _ => target.items.len(),
+        };
+
+        if let Some(target) = self.session_mut(target_session) {
+            target.items.insert(insert_index, item);
+        }
+    }
+
+    fn delete_item_from_session(&mut self, session: &str, item_index: Option<usize>) {
+        let target = match self.session(session) {
+            Some(s) => s,
+            None => {
+                self.state = DocumentState::Error(Error::Session(format!(
+                    "Session '{}' not found",
+                    session
+                )));
+                return;
+            }
+        };
+
+        if target.kind != SessionKind::DocumentCollection {
+            self.state = DocumentState::Error(Error::Session(
+                "Session must be a DocumentCollection".to_string(),
+            ));
+            return;
+        }
+
+        let idx = match item_index {
+            Some(i) => i,
+            None => match target.current_index {
+                Some(i) => i,
+                None => return,
+            },
+        };
+
+        if let Some(target) = self.session_mut(session) {
+            if idx < target.items.len() {
+                target.items.remove(idx);
+
+                let new_len = target.items.len();
+                if new_len == 0 {
+                    target.current_index = None;
+                } else if let Some(current) = target.current_index {
+                    if current >= new_len {
+                        target.current_index = Some(new_len - 1);
+                    }
+                }
+            }
+        }
+    }
 }