Is there a way to mark conditional format on more than one worksheet

Was looking around and haven't seen anything really for this, not sure if formula or VB code, but I have a report that is given at the end of each week.  I'm looking to see if there's a way that a duplicate check can be done on each day where it will look at the other sheet and mark for a duplicate based on the column marked "Invoice".

So if there's an invoice# 123 on Monday and Wednesday, it will highlight invoice red on both days. Is this possible?
ExampleFile.xlsx
NYANBCNY32Asked:
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Let's GoConnect With a Mentor Commented:
If you have lots of data, it may be easier for the user using multiple conditional formatting conditions.  For example,
if there is a duplicate within the day: colour the cell red
if there is a duplicate with Tuesday: colour the cell orange
if there is a duplicate with Wednesday: colour the cell yellow
etc.

Tests would be:
To check for duplicates within a day: COUNTIF(C:C,$c3)>1
To check for duplicates between a day and Tuesday (you would not use this on Tuesday's cells): =NOT(ISNA(VLOOKUP($C3,Tuesday!$C:$C,1,FALSE)))
with similar tests for each other day

A sample of this method (formatting applied to Monday only) is attached.
ExampleFile2.xlsx
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Ingeborg Hawighorst (Microsoft MVP / EE MVE)Connect With a Mentor Microsoft MVP ExcelCommented:
Hello,

you can use a Countif for each sheet and add up the results. If the total  is greater than one, then there is a duplicate in one of the other sheets. For example, create a new rule on column C, starting in cell C2 using this formula:

=COUNTIF(Monday!C:C,C2)+COUNTIF(Tuesday!C:C,C2)+COUNTIF(Wednesday!C:C,C2)+COUNTIF(Thursday!C:C,C2)+COUNTIF(Friday!C:C,C2)>1

Extend the format down to cover all rows and copy the format to column C in all other sheets.

Note that Excel before version 2010 does not allow references to other sheets in conditional formatting formulas. In this case you would need to create named ranges and refer to these instead,

cheers, teylyn
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NYANBCNY32Author Commented:
Thank you both for the help on this piece, it is greatly appreciated and working beautifully.  Cheers.
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