SharePoint online predefined managed properties.

The amount of refiners you can define in SharePoint online is limited. You basicaly need to link a property to a predefined managed property and set an alias.

Found an overview of the predefined managed properties here:
http://technet.microsoft.com/en-us/library/jj219667(v=office.15).aspx#DefaultUnusedMPs

Managed property type Count Managed property characteristics Managed property name range

Date

10

Queryable

Date00 to Date09

Date

20

Multivalued, Queryable, Refinable, Sortable, Retrievable

RefinableDate00 to RefinableDate19

Decimal

10

Queryable

Decimal00 to Decimal09

Decimal

10

Multivalued, Queryable, Refinable, Sortable, Retrievable

RefinableDecimal00 to RefinableDecimal09

Double

10

Queryable

Double00 to Double09

Double

10

Multivalued, Queryable, Refinable, Sortable, Retrievable

RefinableDouble00 to RefinableDouble09

Integer

50

Queryable

Int00 to Int49

Integer

50

Multivalued, Queryable, Refinable, Sortable, Retrievable

RefinableInt00 to RefinableInt49

String

100

Multivalued, Queryable, Refinable, Sortable, Retrievable

RefinableString00 to RefinableString99

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