old stock, new gnucash stock account -- what action should I select in NUM field?

[Michael Carney]

Greetings,

I've got a number of shares of stock, and I'd like to create a gnucash 
account to keep track of them. Adding the stock was easy, as was the 
stock's current value. What 'action' should I select to reflect my 
starting number of shares? Choices are Buy, Dist, Dividend, Fee, Income, 
Interest, LTCG, Price, Sell, Split, STCG. There doesn't appear to be 
documentation describing these values and their purpose, although some 
are obvious. I'm using Equity:opening Balances for Transfer.

Any suggestions would be welcome.

Thanks,
Mike