You will first need to create the custom donation field in LCRM, by following the steps below.
  1. Click Setup at the top-right corner of your screen (you may have to click on your name to see Setup)
  2. Under App Setup on the left panel, click the down arrow next to Opportunities
  3. Select Fields
  4. Below the standard fields, click New
  5. Choose the data type for your custom field
  6. Give the field a Label and a Name. The label and name can be the same, but the name can't contain any spaces. The spaces are most commonly replaced with underscores.
  7. Click Next
  8. Click Save

Now that your field exists in LCRM, it is time to map the field to Luminate Online. Follow the steps below to do so.

  1. Go to Fundraising > select Donation Management
  2. Select the All Donation Forms tab
  3. Find the donation form and click Edit
  4. Go to step 3. Design Donor Screens
  5. Click Edit next to Donation Form
  6. Click New under the list of fields
  7. Select the field in Luminate CRM to which you want to map this field
Once you create the custom field in the donation form, you can map the donation fields between both systems.