How do you derive Total Number of Shares from Myinfo Business data?

Under Shareholders, the Allocation data item refers to the allotted shares to the individual or entity shareholder. So the total number of shares is a sum of all the allocation. 

The percentage of shareholding will then be the allocation of the individual or entity shareholder divided by the total number of shares.

Under Capital, the Share Allotted Amount refers to the total allotted number of entity capital shares. Please note that there are different capital share types.

Under Capital, the Issued Capital Amount refers to the the total issued capital for the entity. The Paid-up Capital Amount refers to the total paid up capital for the entity.