**iantcanada**Lecture 203M Cost: field needs to show when both appointment times are selected but not when only one selected.Is there a formula I can use.

- JotForm Support
**EltonCris**There's a trick to achieve that.

1. Add a form calculation field to your form then hide it

*this is used for conditional purposes only.*2. Add the Thursday inventory widget field in the calculation wizard

3. Then create a condition that if the calculation field value is equal to

**2034520345**show the**Lecture 203M Cost:**field.2034520345 - This number is taken from the two checkbox options when they are both selected.

Demo: https://form.jotform.com/62091133298960

Hope this helps!

**iantcanada**Still is not working

If I select 203M only then is correct - Box 203M cost with $45

If I select 203A only then is correct - Box 203A cost with $45

But is a choose both nothing happens - should have Box 203A&M Cost with $90

Added calc field and Plugged in your condition but nothing happens

Sorry my initial question was a bit confusing

- JotForm Support
**Chriistian**I noticed that the condition you created for 203A&M was with the Thursday field, not the Calculation field. You will need to create a condition for the 203A&M cost so that if the

**Calculation**is equal to**2034520345**, then the 203A&M field will be shown. You can check out the condition below:Here's how it should work after:

Please let us know if you need further assistance.

Regards. **iantcanada**Thank you so much.