Unfortunately, we don't have a split function in Linework yet, but we have a workaround for now:
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Create two separate sessions and check out in Cash and the other in Digital.

For example, the client is Sofia and the total is $200, but she wants to pay $100 cash and $100 digital. Then you create two separate sessions for her.

Here's an article on how to create a new session, and here's how to reschedule your session.

Then you check out the sessions when the client is ready to pay, one cash and one digital.