WorkGuru supports the bulk creation of lead activities via a csv import template. The import template can be uploaded on the imports dashboard (Administration -> Imports)
Select the lead activities option:
Lead Activities Import Field Definition
| LeadNumber | Lead number. Must match existing lead. | Required |
| Owner | Lead activity assignee - must match existing user's full name exactly. | Required |
| Type | Lead activity type. Must match an existing activity type name exactly | Required |
| DueDate | Lead activity due date. Format must be: DD/MM/YYYY | Required |
| CompletedDate | Lead activity completed date. Format must be: DD/MM/YYYY | |
| Description | Lead activity description/details. |