[PeterT]

Well the columns I have defined are as follows:

Lookup Name: readstatus
Column Heading: Reading Status
Column Type: Column built from other columns
Template: {#koboreadpct:'cmp($, 100,cmp($, 0, '', '', 'Reading'), strcat('Finished_',format_date(field('#kobolastread'), 'yyyy')),'')'}
Sort/Search column: By Text
Show in tags browser: Checked

Lookup Name: koboreadloc
Column Heading: Kobo Reading Location
Column Type: Text, column shown in the tag browser

Lookup Name: koborating
Column Heading: Kobo Rating
Column Type: Integers

Lookup Name: koboreadpct
Column Heading: Kobo Read Percentage
Column Type: Integers

Lookup Name: kobolastread
Column Heading: Kobo Last Read Timestamp
Column Type: Date

Lookup name: monthadded
Column heading: Month Added
Column type: Column built from other columns
Template: {:'strcat('ZZ_Added_',format_date(field('date'), 'yyyy'),'_',format_date(field('date'), 'MM'))'}
Sort/Search column: By Text
Show in tags browser: Checked

then in the Device driver, the shelves are set to

#myshelves,  #readstatus, series, #monthadded, authors