The Sync is possible if you use the iCloud backup feature.
The iCloud backup feature is available in the Premium Service. To purchase a Premium Service, tap the "Premium Service" button on the menu screen, and then purchase the "Premium Plan" from the "Service Details" screen.
To use the service, open the "iCloud Backup" screen and tap "Create a Backup". Then you can back up your current household data and store it in iCloud. This means your data is now placed in the cloud. To bring this data back from the cloud and overwrite the device data, "Restore from Backup" Just tap.
To sync your iPhone data to your iPad, you must first use the same Apple ID in both cases, and then use It is assumed that you have. With that in mind, the housekeeping app on either device will be in Premium Service status. If you purchase the Premium Service on your iPhone, you will be able to use the Premium Service on your iPad. On the screen, tap "Previous Purchasers, Restore". Now iPad also came to open the screen of iCloud.
In this state, open the screen of "iCloud backup" in the direction of iPhone that becomes the data source, and then tap Tap Create Backup, tap Create Backup, and save the data to iCloud. Then, when you open the iCloud screen on your iPad, the backup data will be displayed. If it does not appear, please press the refresh button in the upper right corner. In this state, if you tap "Restore from Backup", your iPhone data will be restored to your iPad. It will be synchronized.
Once you've updated the data on your iPad, please reverse the process. Thank you for your cooperation.