Prefill the email subject line in Outlook and keep it editable
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If you use the Fill macro to automatically insert some text into an email subject line in Outlook, you might want to have an opportunity to interactively change that text when needed. If so, you can easily get the desired result with an interactive fillable field.
Create a fillable field for a subject line #
To create a fillable field for filling in the subject of an email message, you need to place the WhatToEnter macro inside the Fill macro, which means you need to make the WhatToEnter macro nested.
Start by adding Fill Subject to your template (see How to add macros to your templates).
When the Fill Subject line dialog shows up, click the Insert nested macro button.

Select What to enter (WTE).
In the What to enter dialog, keep Text field selected. Then specify the field name: the name that the interactive field you’re going to create will have. Enter a default value, text that you want to use by default. When you’re done, click OK.

The WhatToEnter macro that is going to be nested will appear in the Fill Subject line dialog. Click OK.

Save the changes.
As soon as you insert such a template into an email message, you’ll see a dialog showing the default text for the subject line. You can keep this text, or you can change it, it’s up to you.
