You can create your own content blocks that are available to you when you are editing any template or campaign.
Any custom blocks that you have created will appear in the Custom blocks dropdown within the Drag & Drop Email Editor.
Creating Custom Blocks
Hover over an existing block in the content area and click the radio button in the top-left corner. This will select that block. You can select one or more blocks. A selected block will be highlighted in green.
When one or more blocks have been selected, an options dialog will appear on top of the page.
Click on "Create Custom Block" to save the selected as custom blocks. Enter the name of the block and choose an optional icon.
Once a block has been saved, it will be available for selection via the Custom dropdown. You can now use it in all your email campaigns and templates.
Deleting A Custom Block
Please note that when you delete a custom block, it will no longer be available in the Editor. If a custom block has been used inside the email content, it will remain but, you won't be able to re-use it.
To delete a custom block, switch over to the Custom Content Blocks seciton in the Drag & Drop Editor. Hover over the block you wish to delete and click the "x" in the top-right corner.