Just a little clarification on what Gauss is saying here. The attribute name in question is what is set in the html, not the label you see. This html attribute is what gets used when you manually create macros: @{attributenamehere}. As an example, the character sheet you start with may use "str" for strength, but the one you switch to uses "strength", then that attribute will not display on the new sheet (though you may be able to find it on the Attributes & Abilities tab. Since it is using a different html label, that means that any sheetworker set up to calculate a strength modifier will not pick up the original value, since it is looking for the label used in that sheet, not the previous one. The strength modifier may or may not be labeled differently as well. Another thing to keep in mind is that all that information that no longer lines up with the html designations of the new sheet still exists. All of that is stored as part of the sheet data, but simply doesn't display because it doesn't match up with the new sheet html structure. This is especially true of repeating sections: inventory, spells, feats, etc. This means that if you change sheets mid-game and then recreate whatever info doesn't display in the new sheet, you are running with sheets that have nearly double the data saved in them than if you had recreated the characters from the start. It is definitely more work to start fresh, but it is best to start fresh if you want your character sheets to be as slim and fast as they can be.