LG LGL45C - Manual (Page 153)

subject adds your reply to the current conversation.
Changing the subject starts a new conversation.
●
The message will open in a new screen where you can add
or remove addresses, edit the subject, and add or remove
text or attachments, as described in Composing and
Sending a Message on page 149.
●
You can add one or more people to an ongoing
conversation by replying to all and then adding the new
person's address(es) to the message.
●
All of the messages in the conversation are included in the
new message; any messages that follow the message you
forward are omitted.
3. Tap to send the email.
Working with Conversations in Batches
With Gmail, you can archive, label, delete, or perform other
actions on a batch of conversations at once.
1. From the Inbox or another label, tap the checkmark box to the
left of each message for all the messages you want to include
in the batch.
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Accounts and Messaging